HOUSTON (AP) — An animal rights group says Alicia Silverstone appears naked in a television ad promoting vegetarianism that was to debut Wednesday in Houston. The 30-second ad was to air about two dozen times in Houston on Wednesday, the People for the Ethical Treatment of Animals said. PETA said Houston was picked for the commercial’s launch because it is often high on lists of cities with unhealthy eating habits. Houston was named the sixth fattest city in the nation by Men’s Fitness magazine this year.