Natalie Portman played a stripper in Closer and went naked in a Wes Anderson short film called Hotel Chevalier, but the petite beauty says she struggles with nude scenes, fearing that images of her will be uploaded to porn sites.

Her upcoming movie, Black Swan, involves a lesbian sex scene with Mila Kunis that she describes as  “not raunchy — it’s extreme.”

The drama, from The Wrestler director Darren Aronofsky, out in 2010, is about a ballerina whose rival dancer may or may not be another version of herself.

“It’s annoying because online bulls*** interferes with what I want to do artistically,” the Stars Wars star tells V magazine [via the UK’s Daily Mail newspaper] of X-rated work.

“I’m not opposed to sexuality or nudity in a film, but I’m very opposed to pornography sites and you’re pretty much giving them material if you do any of that.

“It’s always a big dilemma for me.”

Meanwhile, Natalie, 28, (who’s been a star since playing the savvy Mathilda in The Professional age 13) is all too aware of the short shelf life of actresses in Hollywood.

“You see people who were stars five years ago and already they’re waning,” she says. “As actresses approach 40, it starts becoming really, really difficult.”

Would she have plastic surgery? “I would hope not,” she says.

However, she’s all for another form of intervention, admitting, “If I have a pimple I want to get rid of it.”

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