They can crack wise -- but can they carry a tune?

Stephen Colbert and Jon Stewart aren't just celebrating Christmas -- they're singing the very soundtrack of it! The former "Daily Show" colleagues will duet on Colbert's Christmas special this November.

"A Colbert Christmas: The Greatest Gift of All!" will feature Colbert trading yuletide harmonies with the likes of Willie Nelson, Elvis Costello, John Legend and of course, funnyman Stewart, says Daily Variety.

The special airs Sunday November 23 on Comedy Central.