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Celebrity Jennifer Lopez sports a leotard dress at
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Celebrity Jennifer Lopez sports a leotard dress at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 18, 2014, in Las Vegas.(Credit: AP)

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Celebrities in leotards

If you thought leotards went out of style with 1980s aerobics classes, then you haven't been paying attention to what some celebrities are wearing on stage and off.