Silverstone strips for Peta ad

TAKE IT OFF: Vegetarian Alicia Silverstone has posed for a provocative Peta advertisement.

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Clueless star Alicia Silverstone has stripped naked for a television ad and poster to promote vegetarianism.

The Clueless actress - who was voted sexiest female vegetarian in 2004 - bared all for the 30-second TV commercial for the goveg.com campaign launched by Peta.

The clip begins with Silverstone sensually pulling herself out of a swimming pool, carefully protecting her modesty with her arms.

It follows with soft shots of the blonde star perched at the edge of the pool with her back to the camera revealing her butt and close-ups of her face.

The 30-year-old actress says over the film, "I am Alicia Silverstone, and I am a vegetarian", before claiming, "There's nothing in the world that's changed me as much as this. I feel so much better and have so much more energy. It's amazing."

The Peta ad' - which was directed by Dave Meyers, who has previously worked on videos for Missy Elliot - will air on the Food Network, Lifetime and E! channels in America before being shown across the US.

Silverstone also appears in a poster for the campaign, in which she is seen sprawled on the ground in front of the pool, under the words: "I am Alicia Silverstone, and I am a vegetarian."