Most of the late night gang is taking a break for the holidays, but Jimmy Fallon and "The Tonight Show" are still trucking along –– and last night can only be described as a holiday miracle. In a completely adorable and ridiculously festive appearance, One Direction stopped by The Music Room and performed an acoustic rendition of "Santa Claus Is Coming To Town" along with Jimmy and The Roots.

It was sweet, simple, insanely cheerful, and yes –– everyone was wearing ugly Christmas sweaters. Check out the full song in the clip below, and don't forget to check back in with Moviefone for the best of late night TV when everyone returns from holiday break!