Ashley Greene, Hayden Panettiere, Leighton Meester & More Raise Their Voices For Charity

By Nuzhat Naoreen

So what does it take to get the stars from "Twilight," "High School Musical," and "Gossip Girl" (just to name a few) to join up on the screen? A really worthy cause. Hollywood's youngest heavy hitters, including "GG" stars Leighton Meester, Ed Westwick and Jessica Szohr, as well as Ashley Greene and Kellan Lutz, recently got together for "Coming Together as ONE," a public service announcement sponsored by the advocacy group ONE, to flight global poverty and preventable disease — specifically in Africa.

The goal of the campaign is to recruit more young people in the battle against poverty. "In the last election, and over the course of history, young people have shown that when we get organized and committed, we are powerful. The fight against extreme poverty and preventable disease in poor countries needs our support, our energy and our commitment," Ashley told ONE.

Directed by Jesse Dylan (he's the same guy who won an Emmy for Barack Obama's "Yes We Can" campaign video), the PSA will air on The CW on Wednesday night. Although, if you want to get a sneak peak, you can check out the video (it launched on the eve of World Aids Day) on ONE's Web site now.

The 60-second clip also features "Heroes" actress Hayden Panettiere, "New Moon" vamps Nikki Reed and Jackson Rathbone, "90210" co-ed Tristan Wilds, "High School Musical" actor Corbin Bleu, John Cho and Brandon T. Jackson.