Mariah Carey Surprises Christmas Concert-Goers With John Legend Duet

The Christmas Queen gifted her fans with a surprise-performance of "When Christmas Comes" with John Legend.

Carey has a lot to be thankful for this holiday season: a spanking-new reality show on E!, a studly young backup dancer to act as her latest arm candy and an inflated bank account thanks to royalties from "All I Want For Christmas Is You." But like all good samaritans, Carey is giving back; she treated the audience attending one of her holiday shows at the Beacon Theater in NYC this week with a duet alongside Legend.

Carey has three more shows lined up: Dec. 8th, 13th and 14th.

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