Easily recognized from her breakout role as Eleven on Stranger Things, Millie already has an Emmy nomination under her belt. Not too bad for a teenager, right? In addition to making waves on the big and small screens, Millie recently launched a makeup line, Florence by Mills. She also carves out time to give back as the youngest person to become a UNICEF Goodwill Ambassador.
What's next: Catch her in The Thing About Jellyfish and Godzilla vs. Kong, which will be released in 2020.