AMA Winners: Complete List Of Winners At 2012 American Music Awards

American Music Awards. ( Kevin Winter / Getty Images ). Usher kicked off the 2012 American Music Awards' 40th-anniversary show by performing a medley of his popular songs at the Nokia Theatre in Los Angeles on Sunday, Nov. 18.

America proved its Bieber Fever was strong: The teen singer dominated the American Music Awards on Sunday night. Bieber's wins included the show's top award, artist of the year.

Justin Bieber took home the first award of the night at the 40th annual American Music Awards–Favorite Male Pop/Rock Artist–but instead of his usual positivity, he set a rather bratty tone for the remainder of the evening.

American Music Awards. ( Kevin Winter / Getty Images ). Usher kicked off the 2012 American Music Awards' 40th-anniversary show by performing a medley of his popular songs at the Nokia Theatre in Los Angeles on Sunday, Nov. 18.

From mentors singing the praises of proteges (Usher and Justin Bieber), to stars worrying about their waistlines (will.i.am), and one music couple that had reporters yelling, "Get a Room!" (Jordin Sparks and Jason Derulo), THR had eyes, ears and noses

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