At 44, she just became a mother of three. You’d think Hollywood stardom slows down with age , it hasn’t. Sienna Miller age is 44, and she’s redefining what a milestone birthday looks like. Standing at 5’5″, Sienna Miller height has never overshadowed her decades-long screen presence.
But it’s her family that’s grabbing headlines lately , Sienna Miller children now total three, with her youngest born just this year. If you think you know her story, her latest chapter might surprise you.
Who Is Sienna Miller?
Sienna Miller was born on December 28, 1981, making her 44 years old as of 2026. Her Capricorn horoscope reflects the disciplined, hardworking reputation she’s built across two decades in film and fashion.
Her full name is Sienna Rose Diana Miller, and she holds dual American-British nationality due to her New York City birthplace and British upbringing. Fans searching “how old is Sienna Miller” consistently land on the same answer: 44, with a birthday every December 28.
Quick Facts Table
Before diving deeper, here’s a snapshot of Sienna Miller’s key stats , age, birthday, height, kids, and relationship status , all in one place for quick reference.
| Detail | Information |
| Full Name | Sienna Rose Diana Miller |
| Age | 44 years old |
| Birthday | December 28, 1981 |
| Birthplace | New York City, US |
| Horoscope | Capricorn |
| Nationality | American-British |
| Height | 5’5″ (165 cm) |
| Net Worth | $18 million |
| Kids | 3 |
| Relationship Status | Dating Oli Green |
Sienna Miller Early Life & Education
Sienna Miller’s early life began in New York City before her family relocated to London when she was just 18 months old. Her ethnicity reflects her European American and British heritage, shaped by a transatlantic upbringing.
Her parents, Edwin Miller and Josephine Miller, raised her alongside her siblings, including sister Savannah Miller, who later became her business partner in fashion.
Family & Childhood
Sienna Miller’s parents played very different roles in her upbringing. Edwin Miller, her father, worked in banking, while Josephine Miller, her mother, came from a modeling background.
Sienna Miller’s siblings include Savannah Miller, Charles Miller, Stephen Miller, and Natasha Corrett. Savannah, in particular, remained close to Sienna both personally and professionally.
Schooling at Heathfield & Lee Strasberg
Sienna Miller’s education began at Heathfield School, Ascot, a well-known boarding school in Berkshire, England. This is where she developed early interests that would eventually shape her acting career.
She later trained at the Lee Strasberg Theatre and Film Institute in New York City, refining the craft that would launch her into major film roles just a few years later.
Sienna Miller Relationship Timeline
Sienna Miller’s relationship status has been a recurring headline throughout her career, from early high-profile engagements to her current relationship. Each chapter reflects a different stage of her personal life.
Her romantic history includes two major relationships before her current one , both of which shaped public interest in her personal timeline.
Jude Law & Tom Sturridge Years
Sienna Miller and Jude Law were engaged in the mid-2000s, a relationship that drew significant media attention at the time. The Jude Law-Sienna Miller age gap was relatively small, as both were in the same career stage.
She was later engaged to Tom Sturridge, with whom she shares her eldest daughter. The Tom Sturridge-Sienna Miller age difference was also minor, unlike her current relationship.
Oli Green Age & Relationship
Sienna Miller is currently dating actor Oli Green, who is 29 years old. The Oli Green-Sienna Miller age gap has become one of the most searched details about their relationship.
Despite the age difference, the couple has built a stable relationship, welcoming two children together and continuing to grow their family in recent years.
Sienna Miller Age Gap Explained
The Sienna Miller age gap with Oli Green sits at roughly 15 years, making it notably wider than her previous relationships with Jude Law and Tom Sturridge.
This age gap boyfriend dynamic has fueled public curiosity, though the couple has largely kept their relationship low-key despite the attention.
Sienna Miller Children Timeline
Sienna Miller’s children span two different relationships, giving her family a layered timeline that fans often want mapped out clearly. Her kids range from teenage to newborn.
Understanding her children’s ages also helps explain the “Sienna Miller age when pregnant” searches tied to her most recent pregnancy at 44.
Sienna Miller, Daughter Marlowe
Sienna Miller’s eldest daughter, Marlowe Ottoline Layng Sturridge, was born in 2012 with ex-fiancé Tom Sturridge. Marlowe is now a teenager, and their relationship remains a private but consistent part of Sienna Miller’s public life.
Second Baby With Oli Green
Sienna Miller welcomed her second child, a daughter, with Oli Green in 2024. This marked her first child with her current partner and the start of their growing family together.
Sienna Miller 3rd Baby Details
In 2026, Sienna Miller welcomed her third child, again with Oli Green, confirming the news through a personal interview. She described feeling “madly in love” with her newborn.
This makes Sienna Miller a mother of three, with her most recent pregnancy occurring at age 44 , a detail widely discussed following the announcement.
Sienna Miller Age Baby News
The Sienna Miller age baby storyline gained traction because she became a first-time mother again at 44, well after her first daughter’s birth over a decade earlier.
Combined with her sister Savannah’s own pregnancy announcement around the same time, the family news trended heavily across entertainment coverage in 2026.
Sienna Miller Height & Stats
Sienna Miller’s height is 5 feet 5 inches (165 cm), a commonly searched stat alongside her age and net worth. Her physical stats are frequently referenced in fashion and red-carpet coverage.
Her estimated net worth stands at $18 million, built through decades of acting, modeling, and her fashion label ventures.
Sienna Miller Career Highlights & Films
Sienna Miller’s breakthrough role came in 2004 with two films released the same year: Layer Cake and Alfie. These roles established her as a serious acting talent beyond her modeling background.
Her career highlights since then include a mix of independent dramas and major studio productions, cementing her reputation as a versatile American-British actress.
Sienna Miller Movies List
Fans searching Sienna Miller’s filmography often want a clear list of her most notable film roles by year, especially those tied to her breakthrough and later career stages.
| Film | Year |
| Layer Cake | 2004 |
| Alfie | 2004 |
| Factory Girl | 2006 |
| The Edge of Love | 2008 |
| G.I. Joe: The Rise of Cobra | 2009 |
| Foxcatcher | 2014 |
| American Sniper | 2014 |
| The Lost City of Z | 2016 |
Sienna Miller’s age during Layer Cake was 22, and she was around 33 during American Sniper , reflecting a career that has spanned her twenties through her forties.
Fashion Label , Twenty8Twelve
Beyond acting, Sienna Miller co-founded the fashion label Twenty8Twelve with her sister Savannah Miller. The brand became a notable extension of her personal style and business ventures outside film.
Conclusion
Sienna Miller age is 44, and her journey reflects a career and life built with purpose. From her breakthrough films to her growing family, Sienna Miller children now number three, with her youngest arriving in 2026. Standing at 5’5″, Sienna Miller height remains a frequently searched detail alongside her family updates.
Her filmography, including standout Sienna Miller movies like Layer Cake and American Sniper, spans over two decades of consistent work. At 44, she balances motherhood, a long-term relationship with Oli Green, and an acting career that continues to evolve with each new role and life chapter.
Also read : Michael Jordan Net Worth 2026 :Forbes-Verified Figures
Frequently Asked Questions
What is the age gap between Sienna Miller and Oli Green?
The Sienna Miller age gap with boyfriend Oli Green is around 15 years, with Sienna at 44 and Oli currently 29 years old.
How many children has Sienna Miller got?
Sienna Miller has three children total , one daughter with Tom Sturridge and two with her current partner, welcomed after Sienna Miller’s age crossed 40.
How old was Sienna Miller when she had her kids?
Sienna Miller’s age was 30 for her first child, and she became a mother again twice more at 42 and 44 years old.
What is Sienna Miller’s ethnicity?
Sienna Miller’s ethnicity is European American and British, reflecting her mixed heritage from an American father and a British-based upbringing in London.
Why did Tom Sturridge and Sienna Miller split?
Tom Sturridge and Sienna Miller ended their engagement around 2015 after years together, though the exact reasons were never publicly confirmed by either party.