Billboard Music Awards

Taylor Swift Taylor Swift performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Justin Bieber Justin Bieber performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Justin Bieber Justin Bieber performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Jennifer Lopez Jennifer Lopez, third from left, performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Jennifer Lopez Jennifer Lopez performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

2013 Billboard Music Awards Arrivals In this photo provided by the Las Vegas News Bureau, actress, comedian Jenny McCarthy walks the red carpet for the Billboard Music Awards at the MGM Grand Garden Arena on the Las Vegas Strip. Sunday, May 19, 2013. (AP Photo/Las Vegas News Bureau, Glenn Pinkerton)

AP Photo/Las Vegas News Bureau, Glenn Pinkerton

2013 Billboard Music Awards Arrivals In this photo provided by the Las Vegas News Bureau, actress/singer Selena Gomez in a sexy dress, slit from top to bottom walks the red carpet for the Billboard Music Awards at the MGM Grand Garden Arena on the Las Vegas Strip. Sunday, May 19, 2013. (AP Photo/Las Vegas News Bureau, Glenn Pinkerton)

AP Photo/Las Vegas News Bureau, Glenn Pinkerton

2013 Billboard Music Awards Arrivals In this photo provided by the Las Vegas News Bureau, actress, singer Hayden Panettiere of TV’s “Nashville” and “Heroes” fame walks the red carpet for the Billboard Music Awards at the MGM Grand Garden Arena on the Las Vegas Strip. Sunday, May 19, 2013. (AP Photo/Las Vegas News Bureau, Glenn Pinkerton)

AP Photo/Las Vegas News Bureau, Glenn Pinkerton

Cee Lo Green, Shaniece Cole, Justin Bieber From left, Shaniece Cole and Cee Lo Green present the milestone award to Justin Bieber at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Cee Lo Green, Shaniece Cole, Justin Bieber From left, Shaniece Cole and Cee Lo Green present the milestone award to Justin Bieber at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Justin Bieber Justin Bieber accepts the milestone award at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Akon Akon performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Wanya Morris, Nathan Morris, Shawn Stockman From left, Wanya Morris, Nathan Morris and Shawn Stockman, of musical group Boyz II Men, arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Wiz Khalifa Wiz Khalifa arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Sky Blu Sky Blu poses backstage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Tyler Hubbard, Brian Kelley Tyler Hubbard, left, and Brian Kelley, of musical group Florida Georgia Line, speak on stage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Sky Blu Sky Blu poses backstage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Morten Harket Morten Harket, of musical group A-ha, poses backstage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Taylor Swift Taylor Swift poses backstage with her awards at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. Swift won awards for top female artist, top Billboard 200 artist, top digital songs artist, top country artist, top Billboard 200 album and top country album for "Red," and top country song for "We Are Never Ever Getting Back Together." (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Taylor Swift Taylor Swift poses backstage with her awards at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. Swift won awards for top female artist, top Billboard 200 artist, top digital songs artist, top country artist, top Billboard 200 album and top country album for "Red," and top country song for "We Are Never Ever Getting Back Together." (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Celine Dion Celine Dion poses backstage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Taylor Swift Taylor Swift poses backstage with her awards at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. Swift won awards for top female artist, top Billboard 200 artist, top digital songs artist, top country artist, top Billboard 200 album and top country album for "Red," and top country song for "We Are Never Ever Getting Back Together." (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Celine Dion Celine Dion poses backstage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Prince Prince performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Prince Prince performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Prince Prince performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Erykah Badu, Janelle Monae Erykah Badu, left, and Janelle Monae announce the icon award at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Nicki Minaj Nicki Minaj performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Lil Wayne, Nicki Minaj Lil Wayne, seated, and Nicki Minaj perform at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Lil Wayne, Nicki Minaj Lil Wayne, left, and Nicki Minaj perform at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Lil Wayne Lil Wayne performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Lil Wayne, Nicki Minaj Lil Wayne, left, and Nicki Minaj perform at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

2013 Billboard Music Awards Arrivals In this photo provided by the Las Vegas News Bureau, British duo Sophia Grace, right, and Rosie, from "The Ellen DeGeneres Show,"arrive at the Billboard Music Awards at the MGM Grand Garden Arena, Sunday, May 19, 2013, in Las Vegas, Nev. (AP Photo/Las Vegas News Bureau, Glenn Pinkerton)

AP Photo/Las Vegas News Bureau, Glenn Pinkerton

Celine Dion Celine Dion presents the award for Billboard artist of the year at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Celine Dion Celine Dion presents the award for Billboard artist of the year at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Celine Dion, Taylor Swift Celine Dion, left, presents the award for Billboard artist of the year to Taylor Swift at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Taylor Swift Taylor Swift accepts the award for Billboard artist of the year at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Taylor Swift Taylor Swift accepts the award for Billboard artist of the year at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Chloe Grace Moretz Chloe Grace Moretz speaks on stage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Pitbull Pitbull performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Gabriel Mann, Stana Katic Gabriel Mann, left, and Stana Katic speak on stage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Wiz Khalifa, Sky Blu Wiz Khalifa, right, and Sky Blu speak on stage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Kelly Rowland, Austin Mahone Kelly Rowland, left, and Austin Mahone present the award for top EDM artist at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Ed Sheeran Ed Sheeran performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Justin Bieber, will.i.am Justin Bieber, second from left, and will.i.am, second from right, perform at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

David Guetta David Guetta accepts the award for top EDM artist at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

David Guetta David Guetta accepts the award for top EDM artist at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Jennifer Lopez Jennifer Lopez is carried as she performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Justin Bieber Justin Bieber performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Justin Bieber Justin Bieber performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Jennifer Lopez Jennifer Lopez performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Jennifer Lopez Jennifer Lopez performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Justin Bieber Justin Bieber accepts the award for top male artist at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Justin Bieber Justin Bieber is congratulated as he is announced the winner of the award for top male artist at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Justin Bieber, Miley Cyrus Miley Cyrus, right, presents the award for top male artist to Justin Bieber at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Miguel Miguel performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Tracy Morgan Host Tracy Morgan, center, performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Nicki Minaj Nicki Minaj accepts the award for top rap artist at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Selena Gomez Selena Gomez, center, performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Chris Brown Chris Brown, center, performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Taylor Swift Taylor Swift, center, performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Carly Rae Jepsen Carly Rae Jepsen poses backstage the award for top digital song for "Call Me Maybe" at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Justin Bieber Justin Bieber, center, performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Madonna Madonna accepts the award for top touring artist at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Madonna Madonna poses backstage with her awards for top touring artist, dance album and dance artist at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Madonna Madonna, winner of the awards for top touring artist, dance album and dance artist, poses backstage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Madonna Madonna poses backstage with her awards for top touring artist, dance album and dance artist at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Ke$ha Ke$ha speaks on stage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Emmy Rossum, Jason Derulo Emmy Rossum, left, and Jason Derulo present the award for top Billboard 200 album on stage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Christina Aguilera Christina Aguilera performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Christina Aguilera, Pitbull Christina Aguilera, right, and Pitbull perform at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Christina Aguilera Christina Aguilera performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Morten Harket Morten Harket, of the musical group A-ha, performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Pitbull, Morten Harket, Christina Aguilera Pitbull, from left, Morten Harket, of the musical group A-ha, and Christina Aguilera perform at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Christina Aguilera, Pitbull Christina Aguilera, left, and Pitbull performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Christina Aguilera, Pitbull Christina Aguilera, right, and Pitbull performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Justin Bieber Justin Bieber performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

will.i.am Will.i.am presents the award for top touring artist at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

will.i.am, Madonna Will.i.am, right, presents the award for top touring artist to Madonna at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Kacey Musgraves Kacey Musgraves, center, performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Madonna Madonna accepts the award for top touring artist at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

will.i.am, Madonna Will.i.am, right, presents the award for top touring artist to Madonna at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Kid Rock Kid Rock presents the award for top rap song at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Taylor Swift Taylor Swift, center, performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Selena Gomez Selena Gomez speaks on stage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Taylor Swift Taylor Swift, center, performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Taylor Swift Taylor Swift performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Carly Rae Jepsen Carly Rae Jepsen poses backstage the award for top digital song for "Call Me Maybe" at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Alyssa Milano Alyssa Milano poses backstage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Alyssa Milano, Avril Lavigne Alyssa Milano, left, and Avril Lavigne present the award for top digital song at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Tracy Morgan Tracy Morgan speaks at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Carly Rae Jepsen Carly Rae Jepsen accepts the award for top digital song for "Call Me Maybe" at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Hayden Panettiere Hayden Panettiere speaks on stage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Carly Rae Jepsen Carly Rae Jepsen accepts the award for top digital song for "Call Me Maybe" at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Chris Brown Chris Brown performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Psy Psy speaks on stage at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Chris Brown, Orianthi Chris Brown, right, and Orianthi perform at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Caroline Hjelt Caroline Hjelt, of musical group Icona Pop, performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Chris Brown Chris Brown performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Chris Brown Chris Brown performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Tracy Morgan, Psy Tracy Morgan, right, and Psy participate in a "dance-off" at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Tracy Morgan, Psy Tracy Morgan, left, and Psy participate in a "dance-off" at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Tracy Morgan, Psy Tracy Morgan, left, and Psy participate in a "dance-off" at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Neil Perry, Kimberly Perry, Reid Perry, Kimberly Perry, center, and Neil Perry, right, of musical group The Band Perry, perform at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Neil Perry, Kimberly Perry, Reid Perry, The Band Perry, from left, Neil Perry, Kimberly Perry and Reid Perry, perform at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Selena Gomez Selena Gomez, center, performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Shania Twain Shania Twain presents the award for top rap artist at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Shania Twain, Nicki Minaj Shania Twain presents the award for top rap artist to Nicki Minaj at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Bruno Mars Bruno Mars performs at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

Photo by Chris Pizzello/Invision/AP

Mike Tyson Mike Tyson arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Casper Smart, Jennifer Lopez Casper Smart, left, and Jennifer Lopez arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Wayne Newton, Jennifer Nettles Wayne Newton, left, and Jennifer Nettles arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Jennifer Lopez Jennifer Lopez arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Miley Cyrus Miley Cyrus arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Shania Twain Shania Twain arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Miley Cyrus Miley Cyrus arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Miguel Miguel arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Kelly Rowland Kelly Rowland arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Chad Kroeger, Avril Lavigne Chad Kroeger, left, and Avril Lavigne arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Chad Kroeger, Avril Lavigne Chad Kroeger, left, and Avril Lavigne arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Ke$ha Ke$ha arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Megan Wollover, Tracy Morgan Megan Wollover, left, and host Tracy Morgan arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Jenny McCarthy Jenny McCarthy arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Cathy Guetta, David Guetta Cathy Guetta, left, and David Guetta arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP

Wiz Khalifa, Amber Rose Wiz Khalifa, left, and Amber Rose arrive at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)

Photo by John Shearer/Invision/AP