Mariah Carey Sings ‘Classroom’ Edition of ‘All I Want For Christmas Is You’ With Jimmy Fallon on ‘Late Night’ (VIDEO)

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Now that’s how you sing a Christmas song.

On Wednesday, Mariah Carey made a surprise appearance on Late Night with Jimmy Fallon for a special rendition of her holiday hit, “All I Want For Christmas Is You.”

Donning a red dress and matching pumps, Mimi delivered her lines as Fallon, Questlove, the guys from The Roots and four adorable children joined in, along with a smorgasbord of classroom instruments (note the colorful xylophone).

“Join the fun + sing along to my festive “All I Want For Christmas Is You” collabo with @jimmyfallon & @theroots!!!” Carey wrote on Twitter Wednesday night.

The American Idol judge is the latest singer to take part in Fallon’s impromptu music sessions.

In early November, Christina Aguilera dropped by the Late Night set to perform “Your Body” with Fallon, The Roots — and office supplies.

The show also welcomed Carly Rae Jepsen in June, with classroom instruments, for a performance of her mega hit, “Call Me Maybe.” Jepsen’s visit remains the most watched video on Fallon’s YouTube channel, wit more than 11 million views to date.

What do you think of Mariah Carey’s surprise visit to ‘Late Night?’ Watch the video above and weigh in below.

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