Justin Bieber performs at the 40th Anniversary American Music Awards on Sunday, 

Justin Bieber performs at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles. (Photo by Matt Sayles/Invision/AP)
Associated Press
Justin Bieber performs at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles. (Photo by Matt Sayles/Invision/AP)
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