Pregnant Kelly Clarkson will celebrate Christmas on TV with her new mother-in-law Reba Mcentire, Whoopi Goldberg, Robin Williams and William Shatner in a festive special. The Since U Been Gone hitmaker will put her acting skills to the test as part of her seasonal special, Kelly Clarkson's Cautionary Christmas Music Tale, a comedic musical take on the meaning of the holiday. She will be joined by actors including Goldberg, Williams and Shatner for the 11 December (13) show, while she will belt out festive classics from her new Wrapped in Red Christmas album with her country music pals McEntire, Blake Shelton and Trisha Yearwood. The TV special will cap off a great few months for Clarkson - she wed talent manager Brandon Blackstock, McEntire's stepson, last month (Oct13) and announced she is pregnant with their first child on Tuesday (19Nov13). Blackstock already has two children from his first marriage.