Millie Bobby Brown fans were shocked to discover how young she is still is when her husband wished her a happy birthday this week.

The English actress became a global sensation as a child star on the smash hit Netflix sci-fi series Stranger Things, playing a telepathic and telekinetic girl called Eleven.

She has since carved out a career for herself as an adult and even started a family, tying the knot with Jon Bon Jovi’s son Jake Bongiovi.

In a few short years, she has managed to rack up so many achievements that her admirers can be forgiven for being astonished at her tender age.

Some observers were in for quite a surprise when Jake fired up his Instagram page on Wednesday to wish his wife well on her milestone birthday.

Posting a mirror selfie with his wife, Jake warmly wrote: ‘Happy 21st baby. I love you so much,’ adding several heart emoji to make his feelings clear.

Millie Bobby Brown fans were shocked to discover how young she is still is when her husband Jake Bongiovi wished her a happy birthday this week

Millie candidly discussed her relationship in a recent interview, explaining that she and Jake made sure they were well-suited to each other before they got married.

‘We were pretty united going into it. We talked about our political views, what kind of family we want to build, the kind of home we want to live in, the kind of relationship we’re looking for, the kind of careers we want,’ she told Vanity Fair. 

‘It’s such an important decision, and we wanted to make sure we were making the right one. I knew I was. It always felt right with him.’

She also shed light on her feelings for Jake, observing that ‘Loving someone and being in love are two different things.’

Millie added: I think I loved a lot of people I was with, like I loved my friends. But he is the first man I’ve ever loved and been in love with. If we’re not fully invested, then what’s the point? We have to be, and we always have been.’

Jake and Millie started dating in 2021 and by May of last year, DailyMail.com confirmed that they had tied the knot in a secret ceremony.

Millie’s parents and Jon attended the ceremony, which ‘was a very low-key, romantic affair with their closest family with them as they said their vows,’ a source said.

A few months before tying the knot, Millie explained that she prefers to preserve a certain degree of privacy when it comes to the details of her wedding to Jake. 

Millie candidly discussed her relationship in a recent interview, explaining that she and Jake Bongiovi made sure they were well-suited to each other before they got married

Some observers were in for quite a surprise when Jake fired up his Instagram page on Wednesday to wish his wife well on her milestone birthday; pictured on her own Instagram

‘I think probably drawing the curtains, just because there are only so many moments in life that you get only once. And to have everyone’s opinions and eyes looking at that just feels unnatural to me,’ she told WWD.

After clandestinely exchanging vows in America, Millie and Jake threw a larger wedding in Tuscany this past September. 

Jon has spoken glowingly of Millie, saying: ‘I’ve gotten to know her in the last year, she works really hard, and she and Jake will grow together in their own way.’ 

The rock star, who got married when he was 27, described Jake and Millie’s romance to the Sunday Times as ‘an accelerated version of what I went through 40 years ago and I think, with the support of family around them, they’re gonna be great together.’