She became a "Stranger Things" star at the age of 12, appeared in film franchises like "Enola Holmes" at 16, and is now married and a mom at 21.
All the while, fans have watched her fashion evolve. She's gone from wearing sparkling dresses with ballet flats to daring gowns with sky-high heels.
Here's how she evolved into the style icon she is today.
Millie Bobby Brown attended one of her first red carpets in 2014.
Millie Bobby Brown at a BAFTA tea party in Beverly Hills, California, on August 23, 2014.
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She was 10 years old at the time and wore a simple gray dress with jewel-encrusted ballet flats.
In 2016, she returned to the red carpet for the "Stranger Things" season one premiere.
Millie Bobby Brown at the "Stranger Things" premiere in California on July 11, 2016.
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She looked glamorous in a gold-and-white dress that she paired with sequin-covered Converse.
The actor then brought her youthful style to the 2016 Emmys.
Gaten Matarazzo, Caleb McLaughlin, and Millie Bobby Brown at the Emmy's on September 18, 2016.
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She wore a black Valentino gown decorated with hummingbird appliqués and carried a square clutch with her name printed on it.
The following year, Brown attended the Golden Globes in silver sparkles.
Millie Bobby Brown at the Golden Globe Awards on January 8, 2017.
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Her gray Jenny Packham dress had an illusion neckline with mesh sleeves and chunky silver sequins. She also wore embellished sandals with short heels.
Brown resembled her "Stranger Things" character at the 2017 MTV Movie and TV Awards.
Millie Bobby Brown at the MTV Movie & TV Awards on May 7, 2017.
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She wore a long-sleeved minidress from Calvin Klein for the event.
It was covered in sequins, and its stark white color matched that of her cowboy boots.
Like most teenagers, Brown occasionally wore edgy looks.
Millie Bobby Brown at the MTV Video Music Awards on August 27, 2017.
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At the 2017 MTV Video Music Awards, she sported a black Rodarte dress with a tulle overlay and lace-up boots.
Even at 13 years old, you could tell Brown would grow into a fashion star.
Millie Bobby Brown at the Emmy Awards in Los Angeles, California, on September 17, 2017.
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Just look at her 2017 Emmys look. She donned a strapless white ball gown by Calvin Klein and pointed pumps in silver.
She then wore a chic leather minidress to the "Stranger Things" season two premiere.
Millie Bobby Brown at the "Stranger Things" season two premiere on October 26, 2017.
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Brown paired the Calvin Klein piece with white kitten heels and a long bob hairstyle.
Brown's fame continued to soar in 2018, but she kept her fashion fun.
Millie Bobby Brown at the SAG Awards in California on January 21, 2018.
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At the SAG Awards in January 2018, she wore a pink, sequined minidress from Calvin Klein. It featured a halter-top bodice, an above-the-knee skirt, and a cape across her back.
She wore it with a classic pair of white Converse sneakers.
A few months later, Brown wore a star-print gown with a sheer bodice and tulle skirt for Paleyfest.
Millie Bobby Brown at Paleyfest in Los Angeles, California, on March 25, 2018.
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Oscar de la Renta designed the high-low piece. She wore it while debuting a curled hairstyle for the first time on a red carpet.
It was at the Time 100 Gala where the young actor really shone.
Millie Bobby Brown at the Time 100 Gala in New York City on April 24, 2018.
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Brown looked elegant that night when she wore a white Dolce & Gabbana gown with flowers attached to its sleeves, bodice, and skirt.
On one rare occasion that year, Brown took a more casual red-carpet approach.
Millie Bobby Brown at the MTV Video Music Awards on August 20, 2018.
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She wore black trousers with an asymmetrical waistline and a crop top with bows attached to its straps.
Rosie Assoulin designed the set.
Fast forward to 2019, and Brown looked like a princess on the "Godzilla: King of the Monsters" red carpet.
Millie Bobby Brown at the UK "Godzilla: King of the Monsters" premiere on May 28, 2019.
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She wore a blush-colored Dior gown with a strapless neckline and lace embroidery. Brown also carried a small, crystal-encrusted purse shaped like a heart.
She wore a similar style for the "Stranger Things" season three premiere in June 2019.
Millie Bobby Brown at the "Stranger Things" season three premiere on June 28, 2019.
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Her pink Rodarte dress had a ruffled, off-the-shoulder neckline, a layered miniskirt, and a floor-length cape.
Brown's style started to mature at the start of 2020.
Millie Bobby Brown at the SAG Awards on January 19, 2020.
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For the 2020 SAG Awards, Brown wore a white Louis Vuitton ensemble. It consisted of trousers worn underneath a high-low skirt, along with a long-sleeved top featuring puffed shoulders and a deep V-neckline.
Then in 2022, Brown was almost unrecognizable at the EE British Academy Film Awards.
Millie Bobby Brown at the EE British Academy Film Awards on March 13, 2022.
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She wore a custom Louis Vuitton dress in black. The sleeveless piece featured a velvet bodice with a peplum waist, a lace lining, and a floor-length skirt.
She also wore elbow-length gloves and a dramatic silver dagger necklace.
The same goes for her appearance at the "Stranger Things" season four premiere.
Millie Bobby Brown at the "Stranger Things" premiere in New York City on May 14, 2022.
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Wearing Louis Vuitton, Brown walked the red carpet in a strapless white dress with a layer of black tulle across one shoulder.
Still, she hasn't stopped having fun on red carpets.
Millie Bobby Brown attends the "Enola Holmes 2" premiere in New York City on October 27, 2022.
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Brown walked the "Enola Holmes 2" red carpet in October 2022 while wearing a custom gown from Louis Vuitton.
The pink halter dress was vibrant and adorned with metallic flowers, giving it a fashionable edge.
In September 2023, the actor proved that she's a Gen Z trendsetter.
Millie Bobby Brown in London, England, on September 11, 2023.
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She was photographed in London wearing a monochrome leather set and an athletic headband — the latter of which became a major trend among Gen Z.
In 2024, she adopted a methodical approach to dressing on red carpets.
Millie Bobby Brown attends the "Damsel" premiere in New York City on March 1, 2024.
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At the "Damsel" premiere, for example, she arrived wearing a metallic gown that looked like it was covered in dragon scales. Louis Vuitton custom-made the piece.
She cemented her style shift with blonde hair at the 2025 SAG Awards.
Millie Bobby Brown attends the 2025 SAG Awards.
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She wore her new hair color styled in an updo, which highlighted her diamond earrings and peach-colored gown.
The sleeveless, silk piece was designed by Louis Vuitton.
She's taken a daring, high-fashion approach to promoting the final season of "Stranger Things."
Millie Bobby Brown at the UK premiere of "Stranger Things" season five on November 13, 2025.
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At the show's recent UK premiere, Brown arrived wearing a bold Ashi Studio design.
The black and gray piece had a corset top with a sweetheart neckline, a tulle skirt wrapped around her waist, and a fluffy train.
Brown wore it with sheer tights and pointed pumps.
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