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Katy Perry Posts 'Topless' Photo Online

6/4/2010 10:28pm EDT

Katy Perry

Pop star Katy Perry celebrated fiance Russell Brand's 35th birthday and the release of his new movie by posting a quirky, doctored 'topless' photo online.

The "I Kissed A Girl" hitmaker photoshopped her face onto Brand's from a topless shot of the Brit that graces the cover of the new issue of Rolling Stone magazine.
In a Twitter post, she writes, "In honor of @rustyrockets birthday; film release! MY Rolling Stone Cover!" and then sends fans to the 'Twitpic.'
Brand turned 35 on Friday.

See more photos of Katy here!

Katy Perry

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Photo Credits: TwitPic; PacificCoastNews.com, Dome, Jones