Jack Black is full of the Christmas spirit and he's not keeping it to himself anymore.

The 'Gulliver's Travels' star has been on a mission to spread good tidings as of late, performing rousing renditions of holiday classics with his famous friends.

Black dropped by 'Late Night With Jimmy Fallon,' where he and the host performed a Blue Man Group-inspired version of 'Little Drummer Boy/Peace on Earth' for fans. Watch!

Check out more celebrities singing after the jump!