In "Celebrity Christmas Cheer," Christina sings "Deck the Halls" while impersonating Celine Dion, Ariana Grande, Idina Menzel, and Kelly Clarkson, among other celebs. We're pretty struck with how great her Ariana impression is, complete with pitch so high, only dogs can hear her singing!
Christina also has a roundup of impersonations for a reading of "Twas the Night Before Christmas," including Drew Barrymore, Keira Knightly, Miley Cyrus, Sarah Jessica Parker, and Sarah Palin. Look for a little song break from Gwen Stefani, Christina Aguilera and Shakira too!
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Gallery | Best of Ariana Grande Memes