Taylor Swift performs at the 38th Annual American Music Awards on Sunday, Nov. 21, 2010 in Los Angeles. Taylor won the Favorite Female Artist award. [Photo: CFP/CFP ]

Singer Rihanna accepts the Soul/Rhythm & Blues Music - Favorite Female Artist award onstage during the 2010 American Music Awards held at Nokia Theatre L.A. Live on November 21, 2010 in Los Angeles, California. [Photo: Kevork Djansezian/Getty Images for DCP]