Sienna Miller and Oli Green have announced they are expecting their second baby together in a loved-up red carpet appearance at the 2025 Fashion Awards.
The Layer Cake actress, 43, and The Crown actor, 28, who welcomed their first child last January, arrived at the Royal Albert Hall with a bump in tow, as Starry Eyed hitmaker Ellie Goulding also revealed her exciting baby news on the same evening.
Sienna cradled her growing midriff, which was just visible under a stunning sheer Givenchy gown, as Oli walked close beside her at the glitzy event, also attended by the likes of Maya Jama, Raye, and Cate Blanchett.
As their relationship is clearly thriving, here’s a look into Sienna and Oli’s romance, from when they met to now.
Who is Sienna Miller’s boyfriend Oli Green?
Oli is also an actor and model who has starred in Zach Braff’s A Good Person and featured in two episodes of Netflix’s The Crown as Rupert Finch, a character based on Kate Middleton’s university boyfriend before Prince William.
‘Thank you Peter Morgan and May el-Toukhy for allowing me to be a small part in this historic show. A true privilege,’ he wrote on Instagram following the premiere.
One of his first acting gigs was in John Eatherly’s Burnout music video alongside Kaia Gerber, having studied the craft at the Strasberg Theatre & Film Institute in New York.
Aside from acting, Oli is an accomplished model, having appeared in Burberry campaigns and shoots alongside the likes of Cara Delevingne.
Earlier this year Oli and Sienna became the first couple to be featured in a Frame denim campaign.
How did they meet?
Sienna and Oli met at a Halloween party in 2021 where they quickly hit it off, but the actress was initially reluctant about pursuing anything serious due to their age gap.
‘I was like, “This is absurd. This will not go anywhere,” she told British Vogue in December 2023. ‘He worked hard to persuade me to go out for a drink with him.’
Before Oli, Sienna was with The Sandman actor Tom Sturridge, 39, for four years from 2011 to 2015. Prior to this, she dated Jude Law on and off from 2004 to 2011.
How many kids does Sienna Miller have and what are their names?
Also shares 13-year-old daughter Marlowe with Far From The Madding Crowd actor Tom.
Sienna and Oli welcomed their baby girl in January last year, but are yet to disclose her name.
Speaking to Harper’s Bazaar after the birth of her second child, Sienna said: ‘I’m in heaven. It’s been a cathartic, healing experience, which sounds woo-woo, but it’s grounded in a way that reflects the life that I want to be living,’ she reflected.
In fact, the screen star felt ‘much more balanced and settled and wise’ than before.
Sienna Miller and Oli Green’s ages: What is the difference?
Sienna is 15 years older than Oli.
Last year, the American Sniper actress got candid about her initial impression of her younger boyfriend.
In an interview with Harper’s Bazaar, the Anatomy of a Scandal star reflected on the ‘catharsis’ of growing her family and her annoyance with falling for a younger guy.
She said: ‘I didn’t expect to take it seriously and then quite quickly, I fell in love.
‘I wasn’t like, “I’m gonna get a younger boyfriend.” It was more, “F**k! Why are you young? That’s so annoying.”‘
Despite her concerns over the age gap, she ultimately found it worked in her favour.
‘There is a difference in the way that generation of men respect women. It’s specific to him, he is very wise and well-adjusted, but I do believe it’s also that generation.
‘They have grown up with a slightly more level playing field. I see it in his female friends as well as in the men.’
‘I think I’ve got some wisdom from all of the things I’ve been through. The more interesting and complicated your life is, the better you’ll end up being.’
Sienna first opened up about their age gap in 2023 when her pregnancy became public knowledge before she had a chance to announce it.
When asked by Vogue, she said: ‘I don’t think you can legislate on matters of the heart. I certainly have never been able to.’
She added: ‘For Oli, it is real that I might want to be with someone older. Female friends of mine in their 40s, they’re meeting younger people who are seeing women as three-dimensional figures.
‘I do want to credit that to some level of the feminist movement working.’
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