What do you follow up with when your buzzed-about documentary wins an Oscar? Well, if you’re the director of The Cove, an intense (often disturbing) look at dolphin poaching and hunting in Japan, you drop a celebrity-filled PSA just in time for Earth Day tomorrow. Watch Jennifer Aniston, Courtney Cox, James Gandolfini, Evan Handler, Mariska Hargitay, Woody Harrelson, John Leguizamo, Jason Mraz, Paul Rudd, Hayden Panettiere, Russell Simmons, Fisher Stevens, Ben Stiller, Naomi Watts, Robin Williams, and plenty of other less bold-faced names fight for their dolphin friends after the jump. Then sign an online petition asking our government officials to take immediate action.