Hayden Panettiere

Hayden PanettierePhoto: Paul Morigi / WireImage

The vegetarian Heroes star figures as something of an eco-action hero in the new documentary The Cove, about the secret slaughter of 20,000 dolphins a year in a small cove in Japan. She received a “Compassion in Action” award from PETA in 2007 for her work saving the dolphins. A lot of celebrities donate money to worthy causes, but not many don a wetsuit and paddle into dolphin-hunter-infested waters to defend their beliefs.