Singer Rihanna performs onstage during the 2013 American Music Awards at Nokia Theatre L.A. Live on November 24, 2013 in Los Angeles, California. (GETTY/AFP)
Rihanna performs on stage at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (AP)
Miley Cyrus performs at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (AP)
Singer Miley Cyrus performs onstage during the 2013 American Music Awards at Nokia Theatre L.A. Live on November 24, 2013 in Los Angeles, California. (GETTY/AFP)
Lady Gaga performs at the American Music Awards at the Nokia Theatre L.A. Live on Sunday, Nov. 24, 2013, in Los Angeles. (AP)
Lady Gaga, foreground, and R. Kelly perform at the American Music Awards at the Nokia Theatre LA Live on Sunday, Nov. 24, 2013, in Los Angeles. (AP)