A very happy birthday was in store for Brown as she welcomed her 21st year of life in a stunning emerald green top.

Millie Bobby Brown made a splash on her 21st birthday, fully embracing an under-the-sea aesthetic for the special occasion.

Millie Bobby Brown doubled down on her recent Y2K aesthetic with an epic bleach-blonde look for her 21st birthday ...

Millie Bobby Brown got all dolled up for her 21st birthday! On Wednesday, February 19, the actress uploaded a cute video that ...

Millie Bobby Brown was only 11 years old when most of her fans met her in the first season of Stranger Things –– but the ...

Millie Bobby Brown turning 20 last year was already mind-blowing and a dose of reality that every child actor has to grow up ...

The "Stranger Things" actress went totally under the sea, with a themed look and cake for the milestone event.

Millie Bobby Brown can officially rent a car! The Stranger Things actor just turned 21, and celebrated her birthday during ...