“Thx for the bday wishes… hi 21 💞” the British star captioned a video of herself putting on a pair of sunglasses and blowing out a candle.

For the big celebration, Millie wore a strapless bright green dress, accessorized with gold earrings, and styled her blonde locks in fishtail braids.

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Young woman in a lavender hoodie and white top sits smiling in a cozy room.

“The most iconic birthday girl ❤️‍🔥❤️‍🔥❤️‍🔥” declared someone else.

After hertransformation, fans have been crossing their fingers at the possibility of Millie portraying the Princess of Pop on the big screen.

Millie expressed her interest in portraying Britney during an appearance onThe Drew Barrymore Showin 2022.

Blonde woman celebrating with a lit birthday candle on a cake, wearing sunglasses, greenery in the background.

“I wanna play a real person,” Millie said when asked about her dream role.

“I think [Britney’s] story, first of all, resonates with me,” theEnola Holmesactress continued, adding that both she and Britney grew up in the spotlight.

“When I look at pictures of her, I feel like I could tell her story in the right way.”

TheGrammy winnerthen took to social media to slam the idea of a biopic being made about her life.

TheStranger Thingsactress used a candle as a cigarette and rocked a pair of sunglasses in a video posted to Instagram

Young woman with long blonde braids and sunglasses, near a cake, in a garden setting.

“I hear about people wanting to do movies about my life… dude I’m not dead!!!’ she fumed on Instagram.

“It’s pretty f**king clear they preferred me dead…I guess my family is going to lock their doors now!!!”

However, in August 2024, it was revealed that Universal had acquired the rights to adapt Britney’s memoir,The Woman in Me, into a motion picture.

Blonde woman in a stylish black dress with graphic elements, showcasing a bold new look.

TheToxicsinger teased the project on X (formerly known as Twitter). Britney mentioned that she was working with Emmy-winning producer Marc Platt, who previously worked onLegally Blonde,Into the Woods,La La Land, andWicked.

“Excited to share with my fans that I’ve been working on a secret project with #MarcPlatt. He’s always made my favorite movies… stay tuned,” she wrote in August 2024.

Her new hairstyle sparked rumors that she might portray Britney Spears in the upcoming biopic about her life

Young woman with a bold new look, sitting on a wooden floor in a black dress, showcasing her blonde hair and sassy style.

Anotheractresswho expressed her enthusiasm for playing the iconic pop princess is Olivia Holt.

“I’m just so grateful to be in the running and around so many names and talent who are in the running for it. Just the idea that I am on people’s minds to play something as iconic as this, would be a dream,” theRunawaysactress gushed.

“I’mNot a Girl, Not Yet a Woman. That’s kind of my favorite. But I also love theCircusera. There are so many eras of Britney. How could you choose?”

Other popular fan ideas for thelead actressinclude Florence Pugh, Sabrina Carpenter, Sydney Sweeney, Addison Rae, Elle Fanning, and Tate McRae.

Blonde woman in a sleek black dress, posing with hands on head, showcasing a bold look for her 21st birthday celebration.

In other Millie news, theDamselstar is getting ready for the release of the fifth and final season ofStranger Things, set to premiere later this year.

“Isn’t graduation supposed to bring relief, like you’re glad to leave behind the teachers and classmates? Not me. I am nowhere near ready to leave you guys.”

She continued: “I love each and every one of you, and I’ll forever carry the memories and bonds we’ve created together as a family. I love you. Thank you.”

Though Britney initially refused to bring her life to the big screen, she later changed her mind, allowing Universal to acquire the rights to her memoir

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Image credits:britneyspears

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As they await the announcement of the season’s release date, fans can look forward to seeingMillieinThe Electric State, a sci-fi adventure film about a girl and her robot embarking on a journey to find her long-lost brother.

“Ready to play Britney now,” one fan wrote, hopeful that Millie will be cast as the lead in the biopic

Comment referencing Millie Bobby Brown’s new look with playful text, “Ready to play Britney now,” accompanied by a heart icon.

Text saying “MILLIE ON BARBIE SEASON” with a heart icon, referencing Millie Bobby Brown.

Comment praising Millie Bobby Brown’s bold new look for her 21st birthday, emphasizing “queen energy.

Birthday message from iamhalsey saying ‘Happy birthday queen!’ with a heart icon.

Comment on social media referencing a new look with blonde hair.

Comment reads: “Britney vibes? (In her prime times obvs.)” with heart icon, referencing Millie Bobby Brown’s bold new look.

Comment saying ‘EPICCCCCCCC HI 21 !!!’ related to Millie Bobby Brown’s bold new look.

Comment praising Millie Bobby Brown as a great actress and a brave woman, expressing trust in her playing Britney Spears.

Comment wishing a happy birthday, featuring username and heart symbol.

Birthday message from hollyjconnolly wishing a beautiful soul a happy birthday with love.

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