Ashlee Simpson, who experienced a near career-wrecking debacle in 2004 when she was caught lip-syncing her supposedly live performance on NBC's Saturday Night Live, may have successfully revived her career -- on London's West End. Debuting Monday night as Roxy Hart in a production of the musical Chicago, Simpson received a huge ovation from the audience, and on Tuesday from reviewers, who called her performance "flawless" and "impressive." Meanwhile, it was announced that Jimmy Kimmel, who opened the 2004 American Music Awards by remarking, "We're here to celebrate the music and the performers who sing and/or lip-sync it," will return as host this year.