40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
Carly Rae Jepsen performs at the 40th Annual American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
IMAGE DISTRIBUTED FOR NOKIA - Joanna Krupa arrives at the Rolling Stone American Music Awards After Party, on Sunday, Nov. 18, 2012 in Los Angeles.
Justin Bieber, right, kisses his mother Pattie Mallette as they arrive at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
IMAGE DISTRIBUTED FOR NOKIA - Gavin DeGraw, left, and Derek Hough arrive at the Rolling Stone American Music Awards After Party, on Sunday, Nov. 18, 2012 in Los Angeles.
Christina Aguilera performs at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
Carrie Underwood performs Two Black Cadillacs at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
ink performs ÂÂTryÂÂ at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
Christina Aguilera performs at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
PSY performs ÂGangnam Style at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
Chris Brown performs ÂEveryday Birthday at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
Justin Bieber, right, and Nicki Minaj perform at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
Ke$ha performs ÂDie Young at the 40th Annual American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
Usher performs at the 40th Annual American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
Gwen Stefani and No Doubt perform ÂLooking Hot at the 40th Annual American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
Kerry Washington arrives at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
Taylor Swift performs ÂI Knew Your Were Trouble at the 40th Annual American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
will.i.am presents the award for artist of the year to Justin Bieber at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.
Ludacris perform ÂEveryday Birthday at the 40th Anniversary American Music Awards on Sunday, Nov. 18, 2012, in Los Angeles.