LAS VEGAS, NV - MAY 20: NHL hockey player Mike Fisher and Singer Carrie Underwood arrive at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Usher arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Katy Perry arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Taylor Swift arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Gladys Knight arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Actress Jurnee Smollett arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Musicians Sky Blu and Redfoo of 'LMFAO' arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Brandy Norwood arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Nelly Furtado arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Miley Cyrus arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Taio Cruz arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: (L-R) Nathan Sykes, Jay McGuiness, Siva Kaneswaran, Tom Parker and Max George of The Wanted arrive at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: (L-R) Actors Ty Burrell and Julie Bowen arrive at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: (L-R) Dee Hilfiger and designer Tommy Hilfiger arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Jordin Sparks arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Kerli arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Musicians Mike Shinoda (L) and Chester Bennington of Linkin Park arrive at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: (L-R) Musicians DJ Virman, Prohgress, Kev Nish and J-Splif of Far East Movement arrive at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Katy Perry and her grandmother arrive at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Musician Kris Kristofferson arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Justin Bieber arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Alicia Keys arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: TV personality 'Downtown' Julie Brown arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Model Amber Rose arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Robin Thicke arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Actress Zooey Deschanel arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Model Chrissy Teigen and musician John Legend arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Actress Julianne Hough arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Musician Kris Kristofferson (L) and singer Joey Fatone arrive at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)

LAS VEGAS, NV - MAY 20: Singer Wiz Khalifa arrives at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on May 20, 2012 in Las Vegas, Nevada. (Photo by Frazer Harrison/Getty Images for ABC)