In a new PSA promoting ONE.org, stars from the teen-centric Gossip Girl and Twilight series joined forces with other recognizable young celebs to appeal to America's college students to help fight poverty around the globe.

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 all make appearances in the PSA, urging their young fans to get involved and make a difference with ONE, which describes itself as "a grassroots campaign and advocacy organization backed by more than 2 million people who are committed to the fight against extreme poverty and preventable disease, particularly in Africa."

Watch the celeb-packed PSA and find out how you can contribute to their cause, after the jump.



According to ONE's website, the PSA will air for the first time during tonight's brand new episode of Gossip Girl (9 PM, CW).

To learn more about ONE and what you can do to help, do what Ed Westwick tells you, and go to ONE.org.