MC Hammer, left, and PSY appear on stage at the close of the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles. (Photo by John Shearer/Invision/AP)

Associated Press
MC Hammer, left, and PSY appear on stage at the close of the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles. (Photo by John Shearer/Invision/AP)
MC Hammer, left, and PSY appear on stage at the close of the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles. (Photo by John Shearer/Invision/AP)
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