The pregnant singer goes nude for a cover shoot. Plus: Beyoncé, Heather Locklear and more

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DEMI DO

It's the shot that has the bloggers buzzing: a pregnant Britney Spears, baring it all on the August cover of Harper's Bazaar – much like Demi Moore once did for Vanity Fair. But the singer's newly dyed locks caught the photographers, who were planning a Brigitte Bardot-themed shoot, by surprise, a source tells PEOPLE.