Some of Hollywood's biggest stars joined CNN's Anderson Cooper for a tribute to ordinary Americans making extraordinary contributions in their communities and beyond.

Among those performing at the event, held at Hollywood's Kodak Theatre, were Grammy-winning artists Christina Aguilera, Alicia Keys and John Legend.

Award presenters included Kate Beckinsale, Jessica Biel, Cameron Diaz, Salma Hayek, Terrence Howard, Selena Gomez, Hugh Jackman, John Krasinski, Lucy Liu, Meg Ryan and Forest Whitaker.

The ceremony, airing on CNN on Thanksgiving Day at 9 p.m., paid tribute to the cable news channel's 10 CNN Heroes of 2008.