Emma Watson nude photos debut from 'Natural Beauty'

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Emma Watson has joined the nude photo club for the sake of charity. "The Bling Ring" star stripped down for her friend, photographer James Houston, to participate in his new book, "Natural Beauty."

The book will raise money for Global Green USA and features nude photos of environmentally aware celebrities and models. Watson promoted her involvement in Houston's project on her Twitter account, tweeting, "My friend is supporting GlobalGreenUSA with his book Natural Beauty. It's out now. : ) X"

This photo shoot comes after Watson laughed off rumors that she will be involved in the upcoming "Fifty Shades of Grey" movie. "Who here actually thinks I would do 50 Shades of Grey as a movie? Like really. For real. In real life," she tweeted. She might be making some people wonder with these new images.

Watson next stars in Sofia Coppola's "The Bling Ring," due out in theaters on June 14 in a limited release.

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Photo/Video credit: James Houston