Mariah Carey's daughter ... still sporting his natural curls. Then, in a moment many moms can surely relate to, Mariah wrote: "The days of, 'You can't straighten your hair!' are over!!" ...

Carey looked incredible, rocking her signature '90s curls—a look that made her a trendsetter back in the day—showing that her hair still holds ... then accompanied Mariah to the iHeartRadio ...