Also appearing on the two-hour special are actress Christina Applegate, American Idol winner David Cook and others. The show will feature performances of holiday standards, comedy sketches and more. Carrie recently told reporters that working with Dolly was a "dream come true" for her. The two perform a duet on the show and share some comical moments together. “I’d never met her before this,” Carrie said. “So I was excited to be able to get to talk to her and obviously get to sing with her. It felt like such a special moment for me in the show to be able to perform with her.” Carrie will also sing her current smash single, "Cowboy Casanova."