A Colbert Christmas: The Greatest Gift of All preview

Stephen Colbert appeared on Good Morning America this morning to talk A Colbert Christmas: The Greatest Gift of All and to offer a first look at his Christmas special.

Diane Sawyer played clips of the special, including one clip with Jon Stewart singing, and surprisingly Stewart can actually hold a note.

The special airs this Sunday November 23 on Comedy Central and the DVD goes on sale November 25. Full interview as follows: