Happy 21st birthday to the coolest and most badass Eleven we know, Millie Bobby Brown! Can you believe that just yesterday you were a fierce 12-year-old stuck in the Upside Down, and now you're officially an adult? Time sure flies when you're saving the world and being a total boss. Here's to more mind-blowing performances, more fashion slayage, and more epic lip-sync battles on your Instagram. Cheers to being legal, Millie! Party hard and make those memories you'll never forget. #StrangerThingsHappenOnYour21st #CheersToABadassAdult #NoMoreEggosForBreakfast