(CNN) -- Grammy Award winners Alicia Keys and John Legend will perform at "CNN Heroes: An All-Star Tribute," airing on Thanksgiving on CNN.
John Legend will sing "If You're Out There" from his just-released album "Evolver."
Hosted by CNN's Anderson Cooper, the program honors the top 10 CNN Heroes of 2008 at the Kodak Theatre in Hollywood, California.
The show will be broadcast globally on CNN, CNN International and CNN en Espaņol at 9 p.m. ET/PT November 27 (0200 GMT November 28).
Each of this year's top 10 CNN Heroes will be honored in a documentary tribute and introduced by a celebrity presenter.
Actors Cameron Diaz, Salma Hayek, Forest Whitaker, Meg Ryan, Terrence Howard, Lucy Liu, Jessica Biel, Kate Beckinsale and Selena Gomez are among the stars participating in the event. See photos of the presenters »
In addition, actor Hugh Jackman will present People magazine's 2008 Heroes Among Us award to six recipients honored by the magazine this year. People is partnering with CNN for this portion of the telecast.
Keys will perform "Superwoman" from her hit album "As I Am." Legend, backed by the Los Angeles-based Agape Choir, will sing "If You're Out There" from his just-released album "Evolver."
The evening will culminate with the announcement of the CNN Hero of the Year, chosen through a six-week online poll that generated more than 1 million votes.
Viewers were asked to select the CNN Hero who inspired them the most from among the top 10 CNN Heroes selected by a blue-ribbon panel.
The Hero of the Year will be awarded $100,000 in addition to the $25,000 that each of the top 10 CNN Heroes receives. Voting for the CNN Hero of the Year has now closed. Watch a close-up look at the CNN Hero Award »
Award-winning producer-director Joel Gallen returns to executive produce this year's program. Among his credits, Gallen produced telethon events supporting victims of the September 11 terrorist attacks and Hurricane Katrina, winning an Emmy Award and a Peabody Award for "America: A Tribute to Heroes."
Kodak Theatre is a 3,400-seat venue that opened in November 2001 and is best known as the first permanent home of the Academy Awards.