Sienna Miller, 44, shares major clue she has welcomed a son with fiancé Oli Green, 29, as she shares rare family snaps during summer holiday

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By KIRSTEN MURRAY, SENIOR SHOWBUSINESS REPORTER

Published: 10:51 BST, 8 August 2026 | Updated: 10:54 BST, 8 August 2026

Sienna Miller appeared to share a major clue that she welcomed a son with her fiancé Oli Green as she took to Instagram on Friday. 

The actress, 44, revealed she had given birth to her third child, her second with Oli, in May. So far the couple have yet to share the baby's gender. 

However Sienna seemed to confirm the couple have welcomed a son as she posted a snap of the three-month-old lying in a pram with a blue heart over their face. 

Meanwhile a makeup free Sienna read to her daughter, whose name has never been announced, as she covered her face with a red heart. 

The star also shared a close up snap of Oli, 29, as the family enjoyed a summer holiday together. 

Sienna also has 14-year-old daughter Marlowe with her ex Tom Sturridge 

Sienna Miller, 44, has shared a major clue she has welcomed a son with her fiancé Oli Green, 29, as she shared rare family snaps during summer holiday om Instagram on Friday 

The star also shared a close up snap of Oli, 29, as the family enjoyed a summer holiday together

She announced she had welcomed her third child in May, simply saying: 'It's happened. I have a tiny baby next door.' 

Sienna announced her third pregnancy by revealing her blossoming bump at the star-studded Fashion Awards in December.

In May, she said that she's surviving on 'very little sleep' as she opened up on returning to work just three weeks after giving birth while appearing on The Tonight Show With Jimmy Fallon.

During her appearance on the show she opened up about the transition of having another child and spoke about her nightmare flight over to the US to promote new action movie Jack Ryan: Ghost War.

Sienna said: 'It feels like stringing sentences together is a bit challenging. I'm on very little sleep but I'm madly in love with my baby.

'It's crazy to be talking words and wearing a dress. What has happened from pajama gate.'

Asked by the host which of her children are tougher to look after, she said: 'I would have said the teenage girl would be harder to juggle until the transatlantic flight I took yesterday with the toddler and the newborn.

'The toddler now wins hands down. It was an absolute disaster. There's no negotiating. I got to the immigration line and just broke down.'

Sienna hinted the couple have welcomed a son as she posted a snap of the three-month-old lying in a pram with a blue heart over their face

The group were also seen enjoying yoga in the sun as they relaxed during the summer holiday 

Last month she posted photos of their whirlwind first few weeks as a family, under the caption 'Adulting'.

The snaps show a blissful Sienna cuddling her newborn in hospital after the birth.

She also shared her first photo of the two-year-old daughter she shares with Oli, posting a sweet snap of her toddler's curly hair. 

In another photo, a heavily pregnant Sienna rests in bed with her bump on show. Childhood photos of Oli along with toys and sports memorabilia cover the shelves, suggesting the couple retreated to his childhood home shortly before the birth. 

Oli also appears in several photos, looking emotional as he held his baby in hospital before pushing the pram near the couple's London home. 

In June, Sienna's sister Savannah confirmed the actress is engaged to Oli.

In an interview with Hello! fashion designer Savannah praised 29-year-old Oli's beautiful proposal.

Savannah said: 'We are all so over the moon. It's the happiest news, and it was beautiful, the whole thing. I can't express how happy I am for her.'

Rumours of Sienna's engagement began the week before when she stepped out with a new diamond ring on her wedding finger.

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