world , I ask you to please join us , '' McCartney said . `` 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 '' features moving musical performances by Aguilera , Keys and Legend . Watch a preview of the show , including Aguilera 's performance '' Aguilera performed her hit single `` Beautiful . '' Legend , backed by the world-renowned Agape Choir , brought the audience of more than 2,000 to their feet with his powerful call to personal action , `` If You 're Out There , '' from his just-released album , `` Evolver . '' Keys sang `` Superwoman , '' her tribute to women around the world , from her hit album `` As I Am . '' 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
HOLLYWOOD , California -LRB- CNN -RRB- -- Singer Christina Aguilera joins fellow Grammy Award winners Alicia Keys and John Legend for `` CNN Heroes : An All-Star Tribute , '' airing Thanksgiving night on CNN . Christina Aguilera performed her hit single `` Beautiful '' at `` CNN Heroes : An All-Star Tribute . '' The show , taped before an audience of more than 2,000 at the Kodak Theatre in Hollywood , pays tribute to the top 10 CNN Heroes of 2008 . Liz McCartney , dedicated to helping survivors of Hurricane Katrina rebuild their homes , has been named the 2008 CNN Hero of the Year . McCartney , of St. Bernard Parish , Louisiana , received the honor at Saturday night 's taping of `` CNN Heroes : An All-Star Tribute . '' The telecast airs at 9 p.m. ET/PT on Thanksgiving on the global networks of CNN . 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