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Sienna Miller stands up and points to her 31-weeks pregnant belly; even on Zoom, her skin is glowing but her breath is a little short as she takes her seat again. The 44-year-old American-born, London-raised actor and model, who became the face of “boho chic” in the early 2000s, is busily wrapping up multiple projects ahead of having her third child, the second with 29-year-old actor Oli Green, with whom she’s been in a relationship since 2021.
Apart from acting work, Miller is also ambassador for British make-up artist Charlotte Tilbury’s new Pillow Talk In Bloom collection. The role was a no-brainer for Miller, given the close relationship she has with Tilbury. “Charlotte and I were working together long before I started out in the film industry,” says Miller, whose acting breakthrough came in two films released in 2004, Layer Cake with Daniel Craig and Alfie, alongside her then-partner Jude Law.
By then, Tilbury and Miller’s paths had already crossed many times. Not only were their respective mothers friends, Tilbury had worked as make-up director on runway shows and Vogue magazine covers featuring Miller, who recalls being on sets with Tilbury and top fashion photographer Mario Testino. “[Charlotte] was very much part of that gang, and if you had [hair stylist] Sam McKnight and Charlotte Tilbury, you had an amazing team around you.”
Tilbury launched her own line of cosmetics in 2013 and Miller says it was an “inevitable thing” that she would become involved with the brand. “I was the inspiration for one of her original Hot Lips lipsticks, Sexy Sienna,” she says. “Our mothers are friends. Charlotte told me she was doing a make-up line and the rest is history. I mean, she just completely blew up!”
Along the way, Miller has picked up a tip or two from the celebrity make-up artist, tricks she has been demonstrating in video tutorials on Tilbury’s YouTube channel. “If you grew up getting freckles in certain areas of your face like I did, putting them back on your face with make-up
can be a real age reverser,” she says, adding that she’s a fan of Tilbury’s Lip Cheat pencil in Foxy Brown for this task. “It’s about blending them slightly, a step Charlotte taught me that remains part of my ritual today.”
Pregnancy means Miller doesn’t have time for complex make-up routines, nor does she much care for them. “I never want to spend time focusing on my face because that’s my day job,” she says. “Going to a hairdresser or putting on make-up feels like work, so I do the bare minimum when I am away from the work environment.”
Her go-to is Tilbury’s Unreal range – balmy, sheer foundation sticks and blush balms for lips and cheeks. “I love the new three-in-one products because they’re versatile. It’s on my lips, it’s on my eyelids, it’s on my cheeks. I’m really lazy with make-up.”
But when it comes to work, Miller is the opposite of lazy, though these days she only takes on projects which excite her. “As I have gotten older, I have learnt how to say no. I was trying to please everybody all the time and it was completely exhausting. You find yourself kind of locked in to agreeing to things. I’ve learnt it’s OK if everybody is a bit pissed off; you have to understand your own limits.
“I’m also built differently. I’ve been able to do a tonne of work, all at the same time, and I don’t seem to run out of steam. And if I do run out of energy, I can push through those moments. But I’ve learnt with age that I don’t want to go to every event. I want to sit at home and be in bed by 9pm sometimes. And I am the happiest person ever when I’m doing this.”
Last year, Miller appeared in two projects – the HBO legal thriller War and the second chapter of Horizon: An American Saga with Kevin Costner (chapter three is on its way). And she’s just wrapped two films – a sporting biopic, Madden, and a yet-to-be-named film adaptation of the Jack Ryan TV franchise. “I’ve only had two months off since January 2025,” she says.
Working with American director David O. Russell (American Hustle, I Heart Huckabees) on Madden was one of the project’s main drawcards, as was the chance to act alongside Nicolas Cage and Christian Bale. “I love David’s films and was so excited to be part of his new one,” she says. “It’s the most creative thing I’ve ever done.
“Many actors have struggled on his sets because he’s really direct,” she continues, “but I love the way he works. You completely know where you stand. And it felt like what I imagined acting was as a child – playing dress-ups with the best actors in the world.”
She’s also just wrapped a new season of War. “Acting alongside some of the best British actors, all shot in London, has been fabulous,” says Miller, came back to live in the British capital in 2023 after some seven years in New York City. “Logistically this one made sense. It’s close to home and it made managing the kids a lot easier. We have grandparents and friends who can help us.”
Miller has a 13-year-old daughter, Marlowe, with ex-partner Tom Sturridge (the pair split in 2015), and a two-year-old daughter with Green (they’ve kept her name private).
“Motherhood later in life really suits me,” she says. “When I was younger, with my first child, it was much more of a conflict. I felt like I was missing out. Now, I am just thrilled to be on a baby schedule. Having an older child and a younger one works for me. And now, with a newborn on the way, it’s an exciting time for our family.”
Becoming a mother again in her 40s, with a new life partner who’s very hands-on with parental duties, is Miller’s happy place. She and Green were the first celebrity couple to appear in a campaign for Frame denim, which she says was a favour to a friend. In fact, friendship is a recurring theme when it comes to deciding which projects to accept.
“I did Jack Ryan with my friend, actor John Krasinski. His wife, Emily [Blunt], is one of my best friends – they’re family to me. We were on holiday for Emily’s 40th birthday, and I was whingeing, saying I need to do a big action film, I need to be in something that people will see. John was like, ‘I have an idea.’
“So Jack Ryan happened by going on a holiday and I got to work with a friend – it was great firing weapons and looking hardcore,” she says of her role as an M16 agent.
Off-screen, Miller will forever be known for her effortlessly chic style. And while she still counts a Gucci jacket in green, red and blue as a favourite and her Chloé tweed coat is a regular go-to, these days her wardrobe is mostly brimming with jumpers and jeans.
“I just don’t have the time to experiment in the way I did when I was younger, but I am looking forward to reclaiming that identity,” she says. “With pregnancy and young babies, there’s not much time to think about that frivolous side of life, and that can really impact how you feel. It’s hard to remember what nice clothes were, now that I have a huge belly and feel like a whale, but I can’t wait for this next chapter.”
And with history repeating, her iconic looks from the early 2000s are all teenage daughter Marlowe cares about. “I hated being labelled ‘boho chic’ at the time, and I felt like my entire identity had been consumed by forces that were completely out of my control,” says Miller. “Now, I love it. Who cares? I know there are other things in life, and what’s funny is that all that fashion is back, and my daughter is loving it.”
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