Millie Bonnie Bongiovi (née Brown; born 19 February 2004), known professionally as Millie Bobby Brown, is a British actress and film producer. She gained international recognition for playing Eleven in the Netflix science fiction series Stranger Things (2016–2025), for which she received nominations for two Primetime Emmy Awards. In 2018, Brown was featured in the Time 100 list of the world's most influential people. She was the youngest person ever appointed as a UNICEF Goodwill Ambassador.
Brown starred in the film Godzilla: King of the Monsters (2019) and its sequel Godzilla vs. Kong (2021). She also starred in and produced the Netflix films Enola Holmes (2020), Enola Holmes 2 (2022), Damsel (2024), The Electric State (2025), and Enola Holmes 3 (2026).
Millie Bonnie Brown was born on 19 February 2004 in Marbella, Andalusia, Spain. She is the third of four children born to British parents Kelly and Robert Brown, an estate agent. She has an older sister, Paige, and brother, Charlie, and a younger sister, Ava. Her middle name is "Bonnie", but "Bobby" became the stage name. Brown was born with partial hearing loss in her left ear and gradually lost all hearing in that ear over several years. At the age of four, she moved with her family back to England, settling in Bournemouth, Dorset. The family moved to Orlando, Florida, when she was eight. Brown has said that she grew up with "no money", and the financial insecurity of her upbringing had affected her relationship with money in adulthood, even after achieving success through Stranger Things as a child actress. Due to growing up in the United States, Brown naturally oscillates between an American accent and her native British accent depending on her environment.
2013–2017: Early roles and Stranger Things
In 2013, Brown made her acting debut as a guest star in the ABC fantasy drama series Once Upon a Time in Wonderland, a spin-off of Once Upon a Time, portraying the role of Young Alice. In 2014, she had a starring role in the BBC America paranormal drama-thriller series Intruders as Madison O'Donnell. She made guest appearances in the CBS police procedural drama NCIS, the ABC sitcom Modern Family and the ABC medical drama series Grey's Anatomy. Those roles weren't enough to keep her family in the U.S. and they moved back to England to stay with her aunt.
In 2016, she auditioned for Lady Lyanna Mormont on Game of Thrones but did not get the role. Then, Brown was cast to play Eleven in the Netflix science fiction horror series Stranger Things. She received critical praise for her performance and she was nominated for the Screen Actors Guild Award for Outstanding Performance by a Female Actor in a Drama Series and the Primetime Emmy Award for Outstanding Supporting Actress in a Drama Series. She then won the Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Drama Series with her co-stars and won the 43rd Saturn Award for Best Performance by a Younger Actor in a Television Series. For her role as Eleven in the second season of Stranger Things, she received her second nominations for a Screen Actors Guild Award and a Primetime Emmy Award in 2018. She reprised the role through to the series' fifth and final season in 2025.
In November 2016, Brown starred in the music video for Sigma and Birdy's single "Find Me". Since November 2016, she has appeared in commercial advertisements for investment and financial service company Citigroup. In January 2017, she made her modelling debut in Calvin Klein's "By Appointment" campaign. The following month, she was signed to the agency IMG Models. Brown appeared in the advertisement campaign of the Italian brand Moncler in the summer of 2018. Brown has also made appearances on the cover of Vogue.
Brown was chosen to voice in the Darren Aronofsky-produced virtual reality experience Spheres: Songs of Spacetime. In 2018, she was named one of the 100 most influential people in the world by Time, becoming the youngest person to be included in the list. Additionally, she was named by Time magazine as one of the most influential teens of 2017 and 2018. That year, she became the youngest person ever to be appointed a UNICEF Goodwill Ambassador. EA Games announced that Brown collaborated with The Sims 4 programmers to feature in the Sims 4 Positivity Challenge. In 2018, The Hollywood Reporter ranked Brown as amongst Hollywood's top thirty stars under age eighteen.
Brown made her feature film debut in 2019 in Godzilla: King of the Monsters, the sequel to the 2014 film Godzilla. She reprised her role in the next sequel, Godzilla vs. Kong (2021). She became the ambassador of UEFA's Together #WePlayStrong campaign. In 2019, Brown launched Florence by Mills, her own beauty product line. It is available at UK pharmacy Boots, Walmart in the United States and Shoppers Drug Mart in Canada. In 2020, Brown starred in and produced the film adaptation of The Enola Holmes Mysteries, and later reprised the role in the 2022 sequel, Enola Holmes 2. According to Variety, she earned $10 million for the role, emerging as one of the year's highest paid actresses in Hollywood. That year, she was also made an ambassador of the fashion brand Louis Vuitton. Brown released her debut novel, Nineteen Steps, based on her own family history, in September 2023. The novel is described as an "epic story of love, loss and secrets".
In 2024, Brown starred in and executive produced the fantasy film Damsel for Netflix, directed by Spanish filmmaker Juan Carlos Fresnadillo based on a screenplay by Dan Mazeau. In 2025, she starred in the Russo brothers's The Electric State, an adaptation of Simon Stålenhag's graphic novel of the same name.
In July 2025, Brown and Gabriel LaBelle were set to star in the Netflix romantic comedy film Just Picture It. In 2026, she reprised her role in Enola Holmes 3.
Brown has engaged in activism with the UNICEF Goodwill Ambassador and serves in prominent global ambassador and rescue roles. She was the youngest person ever appointed as a UNICEF Goodwill Ambassador at age 14 in 2018. She particularly focusing on bullying, online cyberbullying, mental health, climate change, environmental sustainability, animal rights, gun control, children's rights and educational rights. Brown delivered anti-bullying speeches at the 2018 MTV Movie & TV Awards and the 2019 United Nations World Children's Day event. Brown cites actress and humanitarian Audrey Hepburn as her style icon and personal hero.
Brown has publicly supported stricter gun control and actively advocated against gun violence. She honored the victims of the Marjory Stoneman Douglas High School shooting and supported the March for Our Lives movement by dedicated the movement on her Favorite TV Actress winning acceptance speech and wearing a custom Calvin Klein denim outfit with the names of the victims on the back at the 2018 Nickelodeon Kids' Choice Awards.
Brown signed up to be cast in Godzilla: King of the Monsters for her passion on animal rights and environmentalism as the film itself explore heavy real-world themes like animal conservation, environmental protection, and climate change. In 2020, she partnered with Samsung to advocate for greener technology and sustainable futures to empower young people to tackle widespread environmental and social issues through micro-actions within their own communities.
In March 2025, Brown visited a school in São Paulo, Brazil to talked with teenage girls of women’s rights and education in Brazil. Some of these include girls’ experiences with gender-based violence, school dropout, period poverty and limited access to job opportunities.
Brown co-founded the fostering initiative Joey's Friends and uses microchip scanners to help reunite lost pets or take in abandoned animals. She has turned her rural property in Georgia into an active animal rescue sanctuary housing over 60 animals.
Brown launched her own cosmetics and fashion brand, Florence by Mills, on 26 August 2019. The brand has been marketed toward Gen Z adolescent girls, and the products are intended to fit young people's skin. Brown later added fashion and clothing, only available online and not in stores.