We’ve already established that Mariah Carey’s “All I Want for Christmas Is You” is the most perfect holiday tune of the past two decades. In fact, it’s pretty much the only Christmas song we ever look forward to hearing. (Sorry, Sufjan.) So we were thrilled beyond words to learn that Jimmy Fallon, reviver of many great ’90s cultural artifacts, had Carey on the show to perform an unspeakably adorable rendition of the song. Backed by The Roots and the host himself on a selection of instruments you might remember from your elementary-school music class, the performance also featured a small menagerie of kids to sing along on the “you-oo-oo, baby” parts. If you missed it (or just need to see it again), click through to see the diva in action.