Also making the list are Adrian Grenier and Isabel Lucas.  Grenier has a solar-panel-equipped, eco-friendly Brooklyn home, and hosts the show Alter Eco on the Planet Green network. InStyle gives Hayden Christensen a shout-out, too; Christensen is the proud new owner of an organic farm in his native Canada, and his Jumper costar and sweetie, Rachel Bilson, has joined in on his green lifestyle: “I try to be as green as I can. Little things count, like recycling and driving my hybrid car,” Bilson said recently.

Let’s hope more celebrity sweethearts take up the green cause!  For the full list of eco-lovers, visit InStyle Online.