Hammer and PSY perform onstage during the 40th Anniversary American Music Awards 

Hammer and PSY perform onstage during the 40th Anniversary American Music Awards held at Nokia Theatre L.A. Live in Los Angeles on November 18, 2012 -- Getty Premium
Access Hollywood
Hammer and PSY perform onstage during the 40th Anniversary American Music Awards held at Nokia Theatre L.A. Live in Los Angeles on November 18, 2012 -- Getty Premium
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