A post shared by Mariah Carey (@mariahcarey) on Oct 9, 2020 at 12:36pm PDTShe captioned the cryptic snap simply with an emoji of a Christmas tree, which gives us the impression she’s gearing up to bring the world some festive cheer.The initials alongside MC, for Mariah Carey, are AG and JH and it doesn’t take a genius to guess what vocalists could be harmonising with Mariah.Fans rushed to the comments section to scream about Ariana Grande and Jennifer Hudson taking to the stage with the