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The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Christina Aguilera performs onstage during the 40th American Music Awards held at Nokia Theatre L.A. Live on November 18, 2012 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

American Music Awards

Canadian pop superstar Justin Bieber was one of the big winners at Sunday night's American Music Awards, where he took home 'Artist of the Year.'