WARNING: You will want to watch this video over and over again.
The One Direction boys are currently in America, and this week the boys popped along to see Jimmy Fallon to take part in his annual Classroom Instruments skit.
The boys sat down with Jimmy for a jolly 'n' festive sing-a-long!
All dressed up in their Christmas jumpers, One Direction grabbed their classroom instruments (nice work on the triangle, Zayn!) and sang Santa Clause is Coming to Town.
It's basically the gift that keeps on giving because you can just watch it on repeat. Enjoy y'all!
