The latest Sienna Miller children update confirms that the British actress is now a mother of three, with her family spanning a teenager, a toddler and a newborn son. Miller, 44, welcomed her third child with fiancé Oli Green in 2026, adding another chapter to a family life she has largely kept away from the spotlight.
The actress has continued working throughout her pregnancies and early years of motherhood. Her family has also attracted fresh attention after Miller brought her 14-year-old daughter Marlowe to the London premiere of her new legal drama War on September 16, 2026.
Marlowe Remains Miller’s Oldest Child
Marlowe Sturridge is Miller’s first child and was born in 2012 during her relationship with actor Tom Sturridge.
Now 14, Marlowe has grown up largely outside the intense attention that often follows celebrity families. Miller has spoken over the years about her commitment to protecting her daughter’s privacy while also describing their close relationship.
Marlowe’s father, Sturridge, and Miller ended their romantic relationship years ago, but they have continued to co-parent their daughter.
Marlowe occasionally accompanies her mother to major fashion and entertainment events. Her most recent public appearance with Miller came at the War world premiere in London, where the teenager joined her mother on the red carpet.
The appearance was notable because joint public appearances between Miller and her daughter remain relatively uncommon.
A Rare Mother-Daughter Red Carpet Appearance
Miller and Marlowe attended the War premiere at Odeon Luxe Leicester Square on September 16.
The event gave photographers an unusual opportunity to see the mother and daughter together at a major entertainment event. Miller was attending to promote the new legal drama, in which she stars opposite Dominic West.
Marlowe’s appearance also generated attention because of her resemblance to her mother and her increasingly confident fashion choices.
For Miller, the night represented a meeting point between her professional and family lives. While she was there as one of the stars of a major television production, she was also accompanied by her teenage daughter.
Two Younger Children With Oli Green
Miller’s two youngest children are with actor and model Oli Green.
The couple began dating in 2021 and publicly appeared together the following year. Their first child together, a daughter, was born in December 2023.
The girl’s name has not been publicly disclosed, reflecting the couple’s decision to keep much of their children’s personal information private.
Their second child together arrived in 2026. That baby became Miller’s third child overall and gave the family a new dynamic, with three children at very different stages of childhood.
Miller Welcomed Her Third Child in 2026
Miller announced in May 2026 that she and Green had welcomed another baby.
At the time, she did not immediately disclose whether the newborn was a boy or girl, nor did she reveal the baby’s name. She described the early days of caring for the newborn as exhausting but deeply joyful.
The actress later revealed that her youngest child is a boy.
The birth marked an important change for Miller, who suddenly found herself parenting a teenager, a young daughter and an infant at the same time.
She has spoken candidly about the practical reality of caring for children of such different ages, including the challenges of traveling with her two youngest children.
The Family’s Privacy Remains Important
Although Miller is a familiar face on screen and at international events, she has generally avoided turning her children’s lives into a public spectacle.
Her younger daughter’s name has not been widely disclosed, and the name of her baby son has also remained private.
Miller has occasionally offered glimpses of family life through interviews and social media, but those moments have typically stopped short of providing extensive personal information about her children.
In July 2026, she shared photographs offering a glimpse of life with her newborn. The images showed Miller, Green and their baby while maintaining a relatively private approach to the child’s identity.
That balance has become a recurring feature of Miller’s public life: she is willing to discuss motherhood while maintaining boundaries around her children.
Oli Green and Miller Are Engaged
Miller’s family life with Green entered another stage in June 2026 when the couple confirmed their engagement.
The engagement came shortly after the birth of their second child together. Miller and Green had already built a family together over several years, and their engagement formalized another step in their relationship.
Green is also an actor and model. He has appeared in projects including The Crown, while Miller has continued to maintain a substantial acting career of her own.
The couple now share two children, while Miller and Sturridge continue to share parenting responsibilities for Marlowe.
Motherhood Alongside a Busy Acting Career
Miller has not stepped away from acting since becoming a mother.
Her 2026 schedule has included prominent screen work, including War, a legal drama centered on powerful London lawyers and a contentious divorce case. Miller plays Carla Duval, a film star involved in the central dispute.
The series is scheduled to premiere on HBO in the United States on October 1, 2026.
Miller also appeared in Tom Clancy’s Jack Ryan: Ghost War earlier in 2026, demonstrating that motherhood has coincided with a particularly active professional period.
Her ability to continue working while raising three children has become an increasingly visible part of her public story.
What Is Known About Miller’s Three Children?
Publicly available information provides a clear picture of the family structure, although Miller has kept several personal details confidential.
Her oldest daughter is Marlowe, who was born in 2012 and is now 14. Her father is Tom Sturridge.
Miller’s second child is a daughter with Oli Green. She was born in December 2023, but her name has not been publicly shared.
The youngest is a son with Green, born in 2026. His name has also remained private.
This means Miller’s household currently includes children ranging from infancy to the teenage years.
A Family Entering a New Chapter
The latest developments show Miller balancing several major areas of her life simultaneously.
She has welcomed her third child, become engaged to Green and continued appearing in high-profile television and film projects. At the same time, her eldest daughter is entering her teenage years.
The September 2026 appearance at the War premiere offered a particularly visible glimpse into that transition. Marlowe is now old enough to accompany her mother to major industry events, while Miller’s two younger children remain mostly shielded from public attention.
For fans searching for information about Sienna Miller children, the key fact is straightforward: Miller is a mother of three, with Marlowe as her eldest and two younger children with Green.
The actress has made clear through her public comments and selective family appearances that motherhood is an important part of her life, even as she continues building her career on screen.
Frequently Asked Questions
How many children does Sienna Miller have?
Sienna Miller has three children as of September 2026.
Who is Sienna Miller’s oldest daughter?
Her oldest daughter is Marlowe Sturridge, who was born in 2012. Her father is actor Tom Sturridge.
How many children does Sienna Miller have with Oli Green?
Miller and Oli Green have two children together: a daughter born in December 2023 and a son born in 2026.
Is Sienna Miller’s youngest child a boy?
Yes. Miller’s youngest child is a son. She initially kept the baby’s sex private before later revealing that her two daughters had welcomed a baby brother.
Has Sienna Miller revealed the names of her younger children?
The names of Miller’s two younger children with Oli Green have not been publicly disclosed.
How old is Marlowe Sturridge?
Marlowe is 14 years old as of September 2026.