Kelly Clarkson adds Hollywood stars to Christmas show

Robin Williams, Whoopi Goldberg and William Shatner are the latest round of stars to sign up for Kelly Clarkson's Cautionary Christmas Music Tale, the singer's holiday TV special. Country stars Blake Shelton, Reba McEntire and Trisha Yearwood are also slated to perform.

Danica Patrick, Heidi Klum and Jay Leno have been previously announced to join the NBC comedy, which airs Dec. 11 at 10 p.m. ET/PT.

Clarkson, who is promoting her Christmas album, Wrapped in Red, plays a fame-hungry star who learns a lesson about the holiday spirit. Clarkson will perform songs from the album, including Silent Night and White Christmas.