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Mariah Carey, Jimmy Fallon

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Can you say "adorable"?!

Mariah Carey made a surprise guest appearance on Tuesday night's episode of Late Night With Jimmy Fallon and was all smiles as she led the funnyman in a cheerful rendition of her signature holiday classic, "All I Want for Christmas Is You."

The pair were accompanied by The Roots, who played on children's classroom instruments, as well as a chorus of kids, who popped up in the foreground right in front of the camera.

Jimmy sang the uptempo ditty's opening line before letting the American Idol judge do the rest, while he played along with a tambourine and a kazoo.

What a way to ring in the holiday!