Britney Spears has hit back at actress Keira Knightley for slamming her infamous flashing underwear incident. The Pirates of the Caribbean star branded Spears a "slut" after she was photographed flashing her underwear earlier this year (07). But the singer laughed off the , adding, "Who's Keira Knightley? I guess she must need the publicity." Related News: - Keira Knightley Criticises Drunk Celebrities
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