Mariah Carey chats with ET's Denny Directo about her upcoming holiday tour, 'Merry Christmas One and All,' which kicks off on Nov. 15. The singer talks about what fans can expect and how many costume changes she’ll do. Mariah also opens up about her twins, Moroccan and Monroe. She dishes on their involvement in the show, their 'expensive' Christmas gift lists and what she thinks about their TikToks. She also reacts to her 'Queen of Christmas' title and shares what it really means to her.