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Dancing in the buff!

Karina Smirnoff will pose nude in the May issue of Playboy and grace its cover, UsMagazine.com has confirmed.

Who broke the naked news about the 33-year-old, Ukraine-born "Dancing with the Stars" pro3? Hugh Hefner, naturally.

"The May issue of Playboy is unforgettable with 'Dancing With The Stars' Karina Smirnoff on the cover & nude inside," the Playboy founder, 84, Tweeted on Wednesday.

Playboy won't be the only 2011 milestone for Smirnoff, who's partnered on this season's "DWTS" with front-runner Ralph Macchio: She's getting prepped to be a bride!

Last November, Smirnoff got engaged to baseball player Brad Penny, who popped the question with a $95,000 ring. Smirnoff told Us they're planning on a wedding in "November or October" 2011.

"We are still figuring out when and where and how big or small," she said. "Our guest list is already growing!"

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