Justin Bieber, center, performs at the Billboard Music Awards at the MGM 

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)
Associated Press
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)
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