Alicia Keys and John Legend - Perform at CNN Heroes

Alicia Keys and John Legend have been chosen to perform at "CNN Heroes: An All-Star Tribute" set to air next week.

According to CNN, the show will be televised globally on Thanksgiving (November 27) from the Kodak Theatre in Hollywood, California and pay homage to the network's top ten heroes of the year.

Alicia Keys will start off the show by performing her hit single "Superwoman", and John Legend will join with the Los Angeles Agape Choir to sing "If You're Out There."

Anderson Cooper will host the show, and special celebrity guests will also feature as presenters. These include: Cameron Diaz, Salma Hayek, Forest Whitaker, Meg Ryan, Terrence Howard, Lucy Liu and Jessica Biel.

The night's highlight will center on the announcement of CNN's "Hero of the Year" decided upon by voters who cast their choices in a six-week poll on who influenced them the most over 2008. The winner will be awarded $100,000 with $25,000 going to the remaining nine.

"CNN Heroes: An All-Star Tribute" will air on Thursday, November 27 at 9 p.m. EST on CNN.