Gossip Girl’s Leighton Meester, Jessica Szohr and Ed Westwick, Heroes’ Hayden Panettiere, High School Musical’s Corbin Bleu, Twilight’s Ashley Greene, Kellan Lutz, Nikki Reed and Jackson Rathbone, 90210’s Tristan Wilds, Star Trek’s John Cho and Tropic Thunder’s Brandon T. Jackson have all teamed up with ONE Campaign for the fight against global poverty. Will you join them? one.org/buzz