2012 BILLBOARD MUSIC AWARDS

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 Getty Images May 21, 2012

2012 BILLBOARD MUSIC AWARDS

Justin Bieber, Katy Perry, Taylor Swift and co. have hit the red carpet for the 2012 Billboard Music Awards in Las Vegas, Nevada.

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