The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer PSY 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Rapper MC Hammer 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: (L-R) MC Hammer and singer PSY perform 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Chris Brown (L) and rapper Ludacris perform 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Recording artist Pitbull 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)

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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Justin Bieber 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Justin Bieber 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Justin Bieber 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Justin Bieber 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Pink 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Pink 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Rapper/singer Nicki Minaj 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Rapper/singer Nicki Minaj 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Gwen Stefani of No Doubt 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Kesha 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Carly Rae Jepsen 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Carly Rae Jepsen 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Kesha 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Kesha 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Kesha 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Nathan Sykes of The Wanted 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Max George of The Wanted 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Siva Kaneswaran of The Wanted 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Usher 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)

The 40th American Music Awards - Show

LOS ANGELES, CA - NOVEMBER 18: Singer Usher 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)