WATCH: Ariana Grande, Michael Buble Team Up for Christmas Duet "Santa Claus is Coming
 

With Christmas right around the corner, we all k**w that "Santa Claus is Coming to Town," and that's going to bring out the big stars for some unexpected yet welcome holiday duets. Last night (Dec. 18), NBC aired Michael Bublé's fourth annual Christmas special at Radio City Music Hall, fittingly titled Michael Bublé's Christmas in New York, and Ariana Grande joined him for a carol or two, including a jazzy rendition of "Santa Claus is Coming to Town."

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