Mariah Carey has defrosted and is ready for Christmas - but her holly jolly return has backfired! To celebrate the Christmas season kicking off this year, just as soon as Halloween was over, the Queen of Christmas shared a new ad with Sephora this week. In the video, Mariah is seen wearing a white angel costume. She starts to sing her iconic line: "Halloween slayed but now it is t..." Related: Harry & Meghan's Hollywood Career Is 'Hopeless' But she suddenly stops when she notices her makeup has all been stolen by an elf, played by Billy Eichner.