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The long-awaited "Mariah Carey's Magical Christmas Special" debuts today on Apple TV+. The premise is adorable: The North Pole is facing a "holiday cheer crisis" and must call in the only person who can save the day: Santa's pal, Mariah. Special guests include Tiffany Haddish, Billy Eichner, Snoop Dogg, Jermaine Dupri, Misty Copeland, Mykal-Michelle Harris, Ariana Grande and Jennifer Hudson.