• PUMP IT UP photo | Britney Spears

Credit: John Shearer/Invision/AP

Published: Monday May 13, 2013 06:00 AM EDT



After revealing her slimmed-down bod in Shape magazine, Britney Spears trades in her bikini for an equally sexy Roberto Cavalli LBD at Saturday's 102.7 KIIS-FM's Wango Tango music fest in Carson, Calif.

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