2012 American Music Awards opens with Usher, closes with PSY and some Hammer Time

MC Hammer,left, and singer PSY perform onstage during the 40th American Music Awards on Nov. 18, 2012 in Los Angeles. / KEVIN WINTER/GETTY

Legendary hip hop artist MC Hammer surprised the crowd last night as he appeared on stage with new school Korean rapper Psy performing  to hit single “Gangnam Style,” 2012 American Music Awards. The show opened with Usher, closes with PSY and MC Hammer – CBS New.

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