Ariana Grande sings "All I Want for Christmas is You"!

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Hey M Girls,

Is there a better way to get into the holiday spirit than by singing holiday tunes? We love it when our fave celebs sing holiday classics -- and lucky for us, Ariana Grande has done just that!

Check out this vid of Ari singing Mariah Carey's "All I Want for Christmas is You"" -- we can't help but sing along!

Amazing job, Ariana! Totally loving the Santa-inspired dress!

Let's dish: -What do you think of Ariana's performance? What is your favorite Christmas song?

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