Carrie Underwood is planning a two-hour variety special that will air Dec. 7 on the Fox network. Confirmed guests include Dolly Parton, Brad Paisley and fellow American Idol winner David Cook, with additional guests to be announced. The program has not yet been titled. Along with her hits and holiday classics, Underwood will perform music from her new album, Play On, which is scheduled for a Nov. 3 release. The special will be executive-produced by Simon Fuller and directors Nigel Lythgoe and Adam Shankman.