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Emma hot & sweaty

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Is it hot in here? Or is it just her?

A sweaty Emma Watson turns up the heat in a steamy-nude portrait for an environmental awareness project.

The sexy shoot, for a book of portraits titled “Natural Beauty,” could be considered a preview of the former Harry Potter star’s rumored next role — in the film version of “Fifty Shades of Grey.”

The hacker group Anonymous claims it has uncovered documents proving that Watson, 22, is gearing up to play Anastasia Steele in the soon-to-be-shot film based on the best-selling S&M novel.

The group posted some of the files, claiming they were taken from servers at the German studio Constantin Film.

Watson has denied the rumors, saying she isn’t interested in acting in the flick.

“Who here actually thinks I would do 50 Shades of Grey as a movie? Like really. For real. In real life,” she tweeted.

“Good. Well that’s sorted then.”

But the actress sheds her inhibitions for lensman James Houston in his book “Natural Beauty,” which also features shots of Christy Turlington, Adrian Grenier and Brooke Shields. Part of its profits go to the environmental group Global Green USA.