Blake Lively

Blake LivelyPhoto: Anita Bugge / WireImage

She did a spot for The CW’s “Free 2 Be Green” campaign with Gossip Girl co-stars Leighton Meester and Penn Badgley on simple energy conservation (like snuggling up to your hot co-stars instead of turning up the thermostat). Tries to buy “green everything” at the grocery store and apparently helped convince the Gossip Girl crew to favor reusable mugs and cut down on bottled water.