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5 December 2012, 16:43
The chat show host helped the singer perform the festive hit using Christmas toys on his chat show.
Mariah Carey has performed a special version of 'All I Want For Christmas Is You' with Jimmy Fallon.
The US star gave the rare rendition of her famous festive hit on Late Night with Jimmy Fallon earlier this week.
Mariah was joined by Jimmy and his house band The Roots, who played children's toy instruments, and a choir of four children on the song.
Jimmy Fallon has become renowned for his special covers, which have seen him team up with the likes of Justin Timberlake and Christina Aguilera.
'All I Want For Christmas Is You' has become one of the most popular Christmas songs ever since its was released in 1994.
Watch Mariah Carey and Jimmy Fallon perform 'All I Want For Christmas Is You':