CNN Heroes: An All-Star Tribute was held at the Shrine Auditorium in Los Angeles on Dec. 11, 2011.
Miley Cyrus (R) and Liam Hemsworth attend "CNN Heroes: An All-Star Tribute" held at the Shrine Auditorium in Los Angeles on December 11, 2011. UPI/ Phil McCarten
Christy Turlington Burns attends "CNN Heroes: An All-Star Tribute" held at the Shrine Auditorium in Los Angeles on December 11, 2011. UPI/ Phil McCarten