Mariah Carey is a five-time Grammy Award winner and one of the bestselling recording artists of all time, so when her 8-year-old daughter, Monroe, asked her for a little help with TikTok's High Note Challenge, the mom of two delivered. Mariah tapped into her signature whistle register — the highest register of the human voice — to give Monroe, aka Roe, a little bit of behind-the-scenes help in nailing those high notes. So, I'd personally like to declare this mother-daughter duo the winners of this challenge. The big reveal at the end and the look on Roe's face make this video absolutely adorable, and we can't wait for the two to "collab" again soon. See Mariah and her daughter take on the High Note Challenge ahead.