Millie Bobby Brown has made it her ‘life mission’ to play Britney Spears in her upcoming biopic, changing her entire look and reportedly enlisting her famous father-in-law in her attempts to secure the part.

But portraying the Princess of Pop will be no easy feat for the Stranger Things star, whose biggest hurdle is Britney herself – and having watched her audition tape, she is unconvinced that Millie has what it takes.

The actress, 21, has long been vocal been about how much she wants to play the Hit Me Baby… One More Time singer, once describing it as her ‘dream role’ before the tell-all biopic, based on Britney’s best-selling book, The Woman In Me, was announced.

‘Millie Bobby Brown is so desperate to play Britney that those close to her feel it has become her life mission right now,’ an insider told DailyMail.com. ‘She believes she was born for this role. 

‘The problem is, Britney isn’t on board. She doesn’t see the resemblance.’

The insider said that Millie has ‘not spoken directly with Britney’, but added that the singer, who is heavily involved in the project, has ‘seen her audition tape’. 

Millie Bobby Brown has made it her ‘life mission’ to play Britney Spears in her upcoming biopic. But she is facing the biggest hurdle in the singer herself, insiders have told DailyMail.com 

Britney, 43, is currently unconvinced that the Stranger Things star can portray her after watching her audition tape

‘Millie Bobby Brown is so desperate to play Britney that those close to her feel it has become her life mission right now,’ an insider said. ‘She believes she was born for this role’

They claimed that ‘desperate’ Millie is doing everything in her power to convince the pop star, 43, even going as far as revamping her appearance.

Millie debuted a new blonde look earlier this month – one that is strikingly similar to Britney’s – and has flaunted it all over social media.

‘Her new look is clearly an attempt to show she can embody Britney,’ the source said. 

The actress has even tried to use her famous father-in-law, Jon Bon Jovi’s ‘connections’ to help her get the role, according to the insider.

‘She has been trying to leverage connections through her well-connected father-in-law in a bid to land the role that she has dreamed of long before a biopic was even announced,’ they said.

But the source added that no matter how hard Millie tries to ’embody Britney’, the singer is still ‘not convinced’.

‘The casting process has been going on for months, and if Millie were the perfect choice, they would have cast her by now,’ they said.

‘They can make her look like Britney with prosthetics and makeup, but ultimately, Britney will make the final call, and she’s not convinced by Millie right now.’

‘The problem is, Britney isn’t on board. She doesn’t see the resemblance,’ they continued 

Millie debuted a new blonde look earlier this month – one that is strikingly similar to Britney’s – and has flaunted it all over social media

The actress has even tried to use her famous father-in-law, Jon Bon Jovi’s ‘connections’ to help her get the role, according to the insider

Millie’s drastic new look drew fierce criticism online – with some even mistaking her for ‘someone’s mom’ after she was pictured with her younger sister.

The Enola Holmes alum spoke about her desire to play Britney with ET last week.

‘Nothing would make me happier than being able to play such an iconic, beautiful person,’ she said. ‘I leave that to the Gods.’

She also previously told Access Hollywood that she would ‘love nothing more than to be a part of [Britney’s] story’. 

‘I would want someone to bring it to life in the most beautiful way, and I’d always be open to that,’ she added.

During an appearance on the Drew Barrymore Show in 2022, she said playing Britney would be her ‘dream role’ after Stranger Things.

‘I wanna play a real person,’ the actress said at the time, before revealing that she wanted to portray the iconic pop princess.

‘I think her story resonates with me,’ she continued.

But the source added that no matter how hard Millie tries to ’embody Britney,’ the singer is still ‘not convinced’ (Millie seen, left, earlier this week and Britney, right, in 2002)

The insider continued: ‘The casting process has been going on for months, and if Millie were the perfect choice, they would have cast her by now’ 

She pointed out that she and Britney both shared the experience of ‘growing up in public’, and said she related to Britney when she would watch her old interviews. 

At the time, the movie wasn’t even in the works, and Britney seemed to take offense at Millie’s comments.

‘I hear about people wanting to do movies about my life… dude I’m not ᴅᴇᴀᴅ!!!” she wrote on Instagram the following day.

After a dramatic bidding war last year, Universal Studios won the rights to produce a Britney biopic, and Wicked director Jon M. Chu signed on to direct it.

Last month at the Golden Globe Awards, Jon gave an update on the making of the biopic, and he cautioned that telling a sensitive story meant the biopic couldn’t be rushed out.

‘We’re developing it now and it’s a long road ahead,’ he said.

While chatting with Entertainment Tonight, the Crazy Rich Asians director also explained that he was determined to keep Britney in the loop on the film about her life.

‘She’s going to be very involved. I haven’t really started anything fully yet, but she will be very involved in this,’ he said. ‘I have ideas and things, an approach, but it’s very early.’

A separate source previously told DailyMail.com that Britney is working on new music for the soundtrack. 

‘Britney is making music to be included in the soundtrack for her upcoming biopic and is heavily involved in the process,’ the insider exclusively revealed to DailyMail.com.

‘She will rerecord some of her old tracks to fit the film’s vibe and they will also rework some of her music but for the film, she knows that she needs one new banger to really get the excitement going and this will be a song about her entire story.’

Britney’s book sent shockwaves around the globe when it came out last year, over the slew of shocking admissions and bombshell revelations.

She detailed everything from her highly publicized relationship with Justin Timberlake to her 13-year conservatorship. 

It quickly became the ‘highest selling celebrity memoir in history,’ and reportedly sold over two million copies in the US – boosted by the Michelle Williams-narrated audiobook.

According to TMZ, Britney earned 25 percent of the net profits from the book, along with a $12.5million advance.