Millie Bobby Brown was only 11 years old when most of her fans met her in the first season of Stranger Things –– but the actress is not so little anymore as she just celebrated her 21st birthday.

Millie Bobby Brown celebrated her 21st birthday with a bold new look. The Stranger Things actress recently dyed her hair blonde, sparking speculation that she might portray Britney Spears in the upcoming biopic about the singer’s life.

Stranger Things actress Millie Bobby Brown, who married Jon Bon Jovi’s son Jake Bongiovi in 2024, debuted her new blonde hair while blowing out a candle for her 21st birthday on Instagram.

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Millie Bobby Brown is celebrating her milestone 21st birthday in style. The Stranger Things actress took to social media on Saturday, February 22, to share a series of happy snaps via her Instagram which showed her celebrations in Long Bay Beach in Turks and Caicos Islands.

Millie Bobby Brown celebrated her 21st birthday on Wednesday, Feb. 19, and shared a glimpse into how she spent the day, sharing a video of herself sporting platinum blonde fishtail braids and a green bustier as she blew out a candle on a heart-shaped cake.

Millie Bobby Brown got all dolled up for her 21st birthday! On Wednesday, February 19, the actress uploaded a cute video that showed her lighting a candle and sticking it her white and gold heart-shaped cake.

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

Millie Bobby Brown can officially rent a car! The Stranger Things actor just turned 21, and celebrated her birthday during what looks to be a cute dinner with her close circle—where she wore a green bustier and sunglasses.