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James isn't the only Middleton sibling with a few skeletons in his closet.

A risque photo of his older sister, Pippa, 27, surfaced online Wednesday featuring the tanned, svelte Brit dancing in her bra with an unidentified -- and unclothed -- man.

A second photo shows the party planner wearing a skimpy white dress, surrounded by several bottles of booze at what appears to be an intimate gathering.

No word on when the photo was taken -- or what the palace has to say about it -- but this isn't the first time the public has taken notice of her hot body. In 2008, Tatler magazine named Pippa the No. 1 Society Singelton, beating out musician James Blunt and Princess Eugenie.