J Lo to perform "Dance Again" on American Idol 5/10
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Before Rihanna takes the "Idol" stage for the finale, Jennifer Lopez -- now wrapping up her second season at the judges' table -- will perform her new single "Dance Again" on the May 10 results show. David Cook, the season seven "Idol" champ, will also perform "The Last Song I'll Write For You" during the telecast.
