Mariah Carey, Jimmy Fallon

Jimmy Fallon has done it again.

On Tuesday's Late Night, Fallon was joined by his house band The Roots, Mariah Carey and an adorable group of kids to perform Carey's hit song "All I Want For Christmas Is You." Fallon and The Roots, who've already proven their love of using classroom instruments, were also decked out in their finest Christmas sweaters. Watch below:

Which shows should reunite?