Alicia Silverstone, who is set to star in NBC’s sitcom The Singles Table, if ever it gets a timeslot, is appearing in a new PETA commercial. In the buff. The 30-second ad features the blond beauty getting out of a pool saying, “I’m Alicia Silverstone, and I’m a vegetarian. 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.” And did we mention she’s naked? The actress, who peaked at Clueless, then seemed to fizzle, is showing first-hand how being a vegan has been the best course for her body. Once criticized for her weight gain, Silverstone said, “Once I went vegan, I lost the weight I wanted to lose, my nails were stronger, and my skin was glowing. I feel great!” To borrow a phrase (from Clueless, which I have a fond place for in my heart if only for the delicious Paul Rudd), Silverstone is such a Betty.