These celebs take off their clothes for a good cause - charity ... PETA is known for its racy and shocking ads, but has the animal-rights group finally gone TOO far? Sexy supermodel-turned-reality star Joanna Krupa stars in the latest ad campaign (r.) encouraging people not to wear animal fur. Krupa has modeled for People for the Ethical Treatment of Animals before, though the campaigns have been a lot sexier. At least it appears Krupa has a good sense of humor!