Millie Bobby Brown is a British actress, producer, and entrepreneur best known for her breakout role in Stranger Things and her early transition into brand ownership. In 2019, she founded Florence by Mills, a clean beauty and skincare brand designed for Gen Z, emphasizing self-expression and gentle, cruelty-free ingredients. Brown has since expanded her portfolio into fragrance, fashion, and film production, solidifying her as one of the youngest multi-hyphenate founders in entertainment.