Actress Selena Gomez; Selena Gomez & The Scene perform; chef Roberto Martin.

Actor Steve Harvey; actress Mindy Kaling.

Author Howie Mandel ("Here's the Deal"); actress Marie Osmond.

Actor Clint Eastwood ("Invictus"); Overtone performs; 7-year-old Brandt Bickford showcases the hottest toys for the holidays.

Actor Zach Braff ("Scrubs"); Allison Iraheta performs; the latest castoffs from "So You Think You Can Dance").

Actor Tobey Maguire; actress Minnie Driver.

Jennifer Lopez performs; a performance from Cirque du Soleil's KOOZA.

Actor Matt Dillon ("Armored"); actress Ashley Greene ("The Twilight Saga: New Moon"); TV personality Tia Maria Torres ("Pit Bulls and Parolees").

Adam Lambert performs; model Marisa Miller.

Lady Gaga performs; beauty guru Kym Douglas.