HOLLYWOOD, California (CNN) -- Singer Christina Aguilera joined fellow Grammy Award winners Alicia Keys and John Legend for "CNN Heroes: An All-Star Tribute," which honored the top 10 CNN Heroes of 2008. 

Christina Aguilera performs her hit single "Beautiful" at "CNN Heroes: An All-Star Tribute." 

The show, taped before an audience of more than 2,500 at the Kodak Theatre in Hollywood, premiered on the global networks of CNN on Thanksgiving night. 

Liz McCartney, dedicated to helping survivors of Hurricane Katrina rebuild their homes, was named 2008 CNN Hero of the Year. 

McCartney, who will receive $100,000 to continue her work just outside New Orleans, was selected from among the top 10 CNN Heroes after six weeks of online voting at CNN.com. More than 1 million votes were cast. 

"To the country and the world, I ask you to please join us," said McCartney, of St. Bernard Parish, Louisiana. "Together we can continue to rebuild families' homes and lives. ... If you join us, we'll be unstoppable." 

Hosted by CNN's Anderson Cooper, "CNN Heroes: An All-Star Tribute" featured musical performances by Aguilera, Keys and Legend. 

Keys sang "Superwoman," her tribute to women around the world, from her hit album "As I Am." Aguilera performed her hit single "Beautiful." 

Legend, backed by the world-renowned Agape Choir, performed "If You're Out There," from his just-released album, "Evolver." 

All three performances echoed the spirit of the CNN Heroes campaign, which salutes everyday people accomplishing extraordinary things in their communities and beyond. 

"In this time of economic turmoil, it is such a relief to know that there are people like these heroes, people who care more for others than they do for themselves," Cooper said. 
Who were the singers at the show?
Christina Aguilera joined fellow Grammy Award winners Alicia Keys and John Legend for "CNN Heroes: An All-Star Tribute," which honored the top 10 CNN Heroes of 2008. 
