'Baby, It's Cold Outside' is a fun song (with kind of creepy lyrics). It's usually not performed with Chipmunk voices, however.

But on a recent 'Late Night,' Maya Rudolph joined Jimmy Fallon for a funny Christmas duet.

Jimmy wanted to do 'The Chipmunk Song' but then Rudolph revealed they were actually doing 'Baby, It's Cold Outside.' Unfortunately for Jimmy, he's stuck with the mic that Chipmunk-ifies his voice. Rudolph also gets to sing like a Chipmunk once they trade mics. Check out their goofy version of a holiday standard below.

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