The vegan actress, who generated a lot of attention for People for the Ethical Treatment of Animals (PETA) by posing nude in a racy ad for vegetarianism, lives in an eco-friendly house, doesn't wear animal products and only buys goods from companies that never test on animals. In addition to setting up a rescued-pet sanctuary in Los Angeles, she's a supporter of PETA's Save the Sheep and Cows are Cool campaigns.

In addition to being Goodwill Ambassador for the Office of the UN High Commissioner for Refugees (UNHCR), Jolie helped musician Wyclef Jean with Project Clean Streets, an initiative to collect garbage on a regular basis in six municipalities in metropolitan Port-au-Prince, Haiti. She also donated millions of dollars toward a wildlife sanctuary in the northwestern province of Battambang in Cambodia.

Believe it or not, this rock star does not own a car or a television. Her recording studio and house are made of 100 percent reclaimed wood, sheep's wool insulation and solar panels. Not only did she lobby for climate change in the United Kingdom and promote Origins natural beauty products, she also planted more than 6,000 trees in her native Scotland, toured in a biodiesel-powered bus and released her CD "Drastic Fantastic" in Paperfoam packaging (made of potato and tapioca starch). Whew!

Yoga practitioner, supermodel, entrepreneur, mom, activist and author (whoa!) Turlington has been a spokesperson and poster child for antismoking campaigns, PETA and various humanitarian efforts. She is the creator of natural skincare line Sundari and uses eco-friendly, organic cosmetics such as those by Nude Skincare.

Aside from backing the Volvic 1L for 10L partnership, which helps provide clean water to people in Africa, Newton wears and encourages others to wear recycled clothing. After trading in her BMW X5 for a Toyota Prius, she launched a letter writing campaign to get fellow celebrities to ditch their SUVs for greener vehicles.