Alicia Silverstone stars in new Peta ads

Clueless actress Alicia Silverstone stripped down to promote vegetarianism after being voted sexiest female vegetarian in 2004. Silverstone bared all for a 30-second commercial for the goveg.com campaign set up by Peta.

In the commercial Silverstone, 30, says "I am Alicia Silverstone, and I am a vegetarian," she goes on to say, "There's nothing in the world that's changed me as much as this. I feel so much better have so much more energy. It's amazing."

Directed by Dave Meyers, the Peta ad airs on Food Network, Lifetime and E! in Houston, Texas, on Wednesday and then will be show across the U.S.