You might think the butt cheeks spilling out onstage belong to Britney Spears, but they don't.
So can you guess just which bootylicious blonde is baring a large part of her backside to this New York City audience?
Ethan Miller/Getty Images
The Dutchess may look a little tacky, but it's all for a good cause. The Black Eyed Peas performed at the Concert 4 NYC in Central Park last week to benefit the Robin Hood Foundation.
Whatever gets the party started, right?!
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