This Famous Actress Welcomed Her Third Child with a Partner 15 Years Younger – Who Is She

One of the defining tabloid figures of the 2000s has unexpectedly found herself in a much calmer phase of life. She never intended to fall in love with a man much younger than her, and she certainly was not planning on welcoming another baby.

The British actress, once followed relentlessly for her turbulent love life, has now quietly welcomed her third child with a partner nearly 15 years younger than her — and the reaction online has been more relief than shock.

Photos from the pregnancy spread quickly across social media, prompting comments about how happy and settled she appeared. Others noticed something else: her younger partner’s resemblance to a famously complicated former love.

The Halloween Party That Changed Everything

The actress recently confirmed she has welcomed her third child with actor and producer Oli Green, nearly 15 years her junior.

Green, born January 21, 1997, is known for his roles in "Bridget Jones: Mad About the Boy" (2025), "Lift" (2024), and "A Good Person" (2023). The two met at a Halloween party, and the actress, now 44, was entirely unprepared for what followed.

"I didn't expect to take it seriously and then quite quickly, I fell in love," she told Harper's Bazaar.

And when the age gap registered, she put it plainly:

"I wasn’t like, 'I’m gonna get a younger boyfriend.' It was more, '[expletive]! Why are you young? That’s so annoying.'"

What She Never Expected a Younger Man to Give Her

Sienna Miller never imagined herself falling for someone younger, but what surprised her most was the steadiness the relationship brought.

She reflected on what she sees as a generational shift in how younger men relate to women. While she described Green himself as “very wise and well-adjusted,” Miller said she also believes many men his age were raised with a more equal view of relationships and gender dynamics.

The same sense of stability shaped her experience of motherhood the second time around. Speaking to Glamour while pregnant with her third, Miller reflected on what had changed since her first child at 29:

"It's so much easier when you don't have the conflict of feeling scattered and like you want to be doing X, Y, Z. Life is in a more grounded space."

The Baby Nobody Planned, Including Her

Miller had long hoped to give Marlowe, 13, her daughter with actor Tom Sturridge, a sibling. "Because my sister and I had always been such a team," she explained.

But a third pregnancy had not been part of any deliberate plan, particularly as she was preparing to film "Horizon," Kevin Costner's ambitious four-part Western saga.

The news arrived anyway. "I'm in heaven," she said. "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."

The newborn is Miller and Green's second child together. Their first, a daughter born in early 2024, was photographed with the couple shortly after her arrival on a stroll through West London.

Neither child's name has been shared publicly. The five of them now make up what Miller described to E! News as a blended family. She said simply:

"It's happened. I have a tiny baby next door."

The adjustment, she admitted, has come with very little sleep. Still, back home with her newborn, Miller said the exhaustion has been outweighed by something else entirely. “I’m madly in love with my baby,” she added.

'I Guess She Has a Type'

When images of Miller and Green circulated online, the comparisons came quickly. "He is a Young Jude Law," one commenter wrote, while another mirrored the sentiment, "Anyone else see a resemblance to Jude Law when he smiles? I guess she has a type."

Others focused on the present. "Congratulations, she looks super happy. Boyfriend is a cutie," one post read, while a third offered simply:

"She is such a beauty."

Another quipped, "She looks so cute preggers."

But why did so many people immediately think of Law? For many longtime fans, the resemblance carried a deeper layer of memory.

The History That Makes This Chapter Resonate

Born in New York and raised in London, Miller trained at the Lee Strasberg Theatre and Film Institute before breaking out in "Layer Cake" alongside Daniel Craig.

A year later came "Alfie," opposite Jude Law — and with it, a level of public scrutiny she had not anticipated.

Her relationship with Law became one of the defining tabloid stories of the mid-2000s. When the couple's 2005 split became public, with Law acknowledging he had been unfaithful, the coverage was relentless.

Miller later described the breakup as one of the hardest experiences of her life. In interviews years afterward, she admitted the shock of that period was so overwhelming that parts of it had blurred completely from memory.

Decades after her private life became a public spectacle, the woman who once struggled to escape the frenzy surrounding it now seems most at ease in the quieter moments of her life.