It's 9:30 on a Thursday night in Los Angeles, and Jennifer Lopez is on the giant American Idol stage, about to strip off her white terry cloth bathrobe. Practicing for a performance of her upbeat new single, "Dance Again," which will appear on the following week's Idol, the 42-year-old reveals a rhinestone body suit gilded in a peacock palette. Casper Smart, her 25-year-old boyfriend and dance partner, puts his hands on her shoulders, hips, thigh and then snaps her around to face him, her caramel hair teased beach-sexy silhouetted against magenta lasers.
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