Hayden Panettiere - Not just a hero on television, in 2007 Hayden joined a protest off the coast of Japan against dolphin hunting, which led to a sketchy confrontation--but also netted her PETA's "Compassion in Action" award. A year later, she hand-delivered letters of protest to the Norwegian and Japanese ambassadors to the United States, calling for an end to whale hunting. Hayden backs up her animal activism in her personal life, maintaining a vegetarian diet. This starlet may just be starting out in Hollywood, but she's already built a green reputation that outstrips most of her peers.