Usher performs at the 40th Annual American Music Awards.
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Justin Bieber, right, and Nicki Minaj perform take the stage.
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Pink performs "Try."
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Taylor Swift performs "I Knew Your Were Trouble."
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Nathan Sykes of The Wanted performs.
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Carly Rae Jepsen and dancers perform.
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Justin Bieber performs at the 40th Anniversary American Music Awards.
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Chester Bennington of the band Linkin Park performs "Burn It Down."
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Apolo Anton Ohno, left, and Kerry Washington present the award for favorite artist in alternative rock.
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Nathan Sykes of The Wanted performs.
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From left, Nick Carter, Howie Dorough, Brian Littrell, Kevin Richardson, and A.J. McLean of the band Backstreet Boys present the New Artist of the Year award.
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Ke$ha performs "Die Young."
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Gwen Stefani of No Doubt performs "Looking Hot."
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The Wanted, from left, Siva Kaneswaran,Tom Parker, Nathan Sykes, Max George, and Jay McGuiness perform.
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From left, Dave Haywood, Hillary Scott and Charles Kelley of the band Lady Antebellum accept the award for favorite band, duo or group in country.
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Nicki Minaj performs "Freedom."
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Gwen Stefani and No Doubt perform "Looking Hot."
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Justin Bieber performs at the 40th Anniversary American Music Awards.
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Tom Dumont, left, Tony Kanal and No Doubt perform "Looking Hot."
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Kelly Clarkson performs a medley of her songs.
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Members of Linkin Park, from left, Joe Hahn, Rob Bourdon, Mike Shinoda, Chester Bennington, Dave Farrell, and Brad Delson accept the award for favorite artist in alternative rock.
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Carly Rae Jepsen performs "This Kiss" and "Call Me Maybe."
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Usher accepts the award for favorite male artist in soul/R&B.
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Taylor Swift performs "I Knew Your Were Trouble."
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Taylor Swift performs "I Knew Your Were Trouble."
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Colbie Caillat, right, and Gavin DeGraw present the award for favorite band, duo or group - country at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles. (Photo by Matt Sayles/Invision/AP)
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Ke$ha performs at the 40th Annual American Music Awards.
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Adrian Young, from left, Gwen Stefani and Tony Kanal from the band No Doubt perform at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles. (Photo by Matt Sayles/Invision/AP)
Matt Sayles/Invision/AP
Usher performs at the 40th Annual American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.(Photo by Matt Sayles/Invision/AP)
Matt Sayles/Invision/AP
Justin Bieber accepts the award for favorite male artist in pop/rock.
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Usher performs at the 40th Annual American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles. (Photo by Matt Sayles/Invision/AP)
Matt Sayles/Invision/AP