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Musician Will.i.am performs onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169081354 )

Rapper Nicki Minaj and rapper Lil Wayne perform onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169081640 )

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) ( 2013 Billboard Music Awards Show )

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) ( 2013 Billboard Music Awards Show )

DJ David Guetta performs onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169081344 )

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) ( 2013 Billboard Music Awards Show )

Singer Miguel performs onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169079621 )

Singer Miley Cyrus speaks onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169079727 )

Actress Chloe Grace Moretz speaks onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169080217 )

Madonna poses in the press room with the Top Touring Artist Award during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images) ( 169079657 )

Singer Jennifer Lopez performs onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169079719 )

Selena Gomez, right, congratulates Taylor Swift, winner of the award for top Billboard 200 album for "Red," 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) ( 2013 Billboard Music Awards Show )

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) ( 2013 Billboard Music Awards Show )

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) ( 2013 Billboard Music Awards Show )

Singer Madonna accepts the award for "Top Touring Artist" presented to her by musician Will.i.am (R), during the Billboard Music Awards at the MGM Grand Garden Arena in Las Vegas, Nevada May 19, 2013. REUTERS/Steve Marcus ( USA/MUSIC-BILLBOARDAWARDS/ )

Singer Madonna accepts the award for "Top Tourning Artist" onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169078189 )

Singer Taylor Swift accepts the award for "Top Billboard 200 Album" onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169079307 )

Singer Miley Cyrus speaks onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169079560 )

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) ( 2013 Billboard Music Awards Show )

Musicians Pitbull and Christina Aguilera perform onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169079476 )

Singer Christina Aguilera performs onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169079437 )

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) ( 2013 Billboard Music Awards Press Room )

Musician Jennifer Nettless speaks onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169076751 )

Host Tracy Morgan and musician Psy speak onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169078016 )

Caroline Hjelt of "Icona Pop" performs onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169077644 )

Singers Caroline Hjelt and Aino Jawo of "Icona Pop" perform onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169077544 )

Singer Bruno Mars performs onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169076144 )

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) ( 2013 Billboard Music Awards Show )

Selena Gomez performs during the Billboard Music Awards at the MGM Grand Garden Arena in Las Vegas, Nevada May 19, 2013. REUTERS/Steve Marcus ( USA/MUSIC-BILLBOARDAWARDS/ )

Singer Shania Twain presents the award for "Top Rap Artist" to rapper Nicki Minaj onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169077680 )

Singer Carly Rae Jepsen accepts the award for "Top Digital Song" onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169077933 )

Presenters Alyssa Milano and Avril Lavigne speak onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169078084 )

Singer Taylor Swift performs onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169077833 )

Singer Taylor Swift performs onstage during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images) ( 169077834 )

The Band Perry 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) ( 2013 Billboard Music Awards Show )

Host Tracy Morgan speaks onstage during the Billboard Music Awards at the MGM Grand Garden Arena in Las Vegas, Nevada May 19, 2013. REUTERS/Steve Marcus ( USA/MUSIC-BILLBOARDAWARDS/ )

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) ( 2013 Billboard Music Awards Arrivals )

Alyssa Milano poses in the press room during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images) ( 169077853 )

Actress Jennifer Morrison arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images) ( 169076252 )

TV personality Audrina Patridge arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images) ( 169076200 )

Actress Hayden Panettiere arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images) ( 169074512 )

Singer/Actress Miley Cyrus arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images) ( 169076378 )

Z LaLa arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images) ( 169072224 )

Singer Nicki Minaj arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images) ( 169075976 )

Singer Taylor Swift arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images) ( 169074760 )

Taylor Swift 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) ( 2013 Billboard Music Awards Arrivals )

Actress Selena Gomez arrives at the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Jason Merritt/Getty Images) ( 169072198 )

Selena Gomez 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) ( 2013 Billboard Music Awards Arrivals )