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Justin Bieber accepts the award for artist of the year with his mother Pattie Mallette at the 40th American Music Awards in Los Angeles, California, November 18, 2012 (Credit: Reuters)

Justin Bieber accepts the award for artist of the year with his mother Pattie Mallette at the 40th American Music Awards in Los Angeles, California, November 18, 2012 (Credit: Reuters)