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 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 Taylor Swift 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 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: 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 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: Singer Taylor Swift 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 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 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: Singer Taylor Swift 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 Taylor Swift 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 Taylor Swift 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)