With Christmas right around the corner, we all know 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."

Wearing a bright red jumpsuit and lipstick to match (channeling Old Saint Nick in a way), Grande and Buble traded off verses of the jolly anthem, all while a big band swung the beat behind them.

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As should have been expected, Bublé and Grande's voices blended together perfectly well for the jazzy spin on "Santa Claus is Coming to Town." For their take on this classic, Grande threw in plenty of little runs and woos to spice things up a bit, while Bublé kept things a little more traditional. But, it worked.

Watch Ariana Grande and Michael Bublé perform "Santa Claus is Coming to Town" for Michael Bublé's Christmas in New York below:

Grande was also on hand to perform her cover of Wham!'s "Last Christmas." And she wasn't Bublé's only special guest. He also brought along Barbra Striesand, Miss Piggy, The Rockettes and more for his special.

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