Justin Bieber performs at the MGM Grand Garden Arena as he tours in support of his new album, 'Believe' in Las Vegas on September 30, 2012 -- Getty Images

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Justin Bieber performs at the MGM Grand Garden Arena as he tours in support of his new album, 'Believe' in Las Vegas on September 30, 2012 -- Getty Images
Justin Bieber performs at the MGM Grand Garden Arena as he tours in support of his new album, 'Believe' in Las Vegas on September 30, 2012 -- Getty Images
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