Sienna Miller just made one of the most stylish pregnancy announcements you could imagine. At the 2025 Fashion Awards in London, the actress stepped onto the red carpet at the Royal Albert Hall in a stunning sheer white Givenchy gown that elegantly showcased her growing baby bump. By her side was her partner, actor and model Oli Green, 28, with whom she welcomed her second child just last year. This new addition will be Miller’s third child overall, a happy expansion of a family that she has thoughtfully and intentionally built over the past decade.
This joyful reveal marks the latest chapter in Miller’s journey through motherhood, a journey that has been both public and deeply personal. At 43, she is embracing pregnancy again, having openly spoken in the past about the pressures she felt to have more children and her proactive decision to freeze her eggs when she turned 40. Her family is a beautiful blend: she is the proud mom to a teenage daughter from a previous relationship and a toddler with Green, whose name the couple has lovingly kept out of the public eye. As she prepares to welcome baby number three, the actress’s life reflects a story of modern family-building, defined by patience, unexpected love, and sisterly bonds.
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An Expanding Family, Defined by Love and Patience
Sienna Miller’s path to becoming a mom of three has been guided by self-awareness and a rejection of external timelines. She has been candid about the “really loud noise” of societal pressure she felt about having children, particularly as she navigated her thirties. Feeling that “biology is incredibly cruel on women in that decade,” she took matters into her own hands and chose to freeze her eggs at age 40, a decision that allowed her to release the anxiety and adopt a more peaceful mindset of “if it happens, it happens.”
The subsequent expansion of her family came with Oli Green, a partner she didn’t initially expect to fall for. She has humorously recalled her reaction to their 15-year age gap, thinking, “F***! Why are you young? That’s so annoying.” However, she credits his generation with a more respectful and leveled approach to relationships, calling him “very wise and well-adjusted.”
The couple’s first child together, a daughter, was born in late 2023 or early 2024. In true Miller fashion, she has kept this little one’s life intensely private; despite being in the public eye for over a year, her name has not been publicly disclosed. Miller has described this chapter of motherhood as a “cathartic, healing experience” that has left her feeling more grounded and settled than ever before. Now, with another baby on the way, due in 2026, her family is entering an exciting new phase. She has even cheekily noted that her third pregnancy, which began before her second child turned two, was “a total surprise.”
Marlowe: The Stylish Big Sister at the Heart of the Family
Long before her younger siblings arrived, Sienna Miller’s world revolved around her first child, daughter Marlowe. Miller shares Marlowe, who is now 13 years old, with her ex-partner, actor Tom Sturridge; the two were together from 2011 to 2015 and have maintained a friendly co-parenting relationship. Marlowe has gracefully transitioned into her role as the eldest, a journey Miller has openly observed. When her first sister was born, Miller admitted that the adjustment was “a lot for her” initially, but that she quickly warmed up. The bond between the sisters is clearly special, with Miller sharing that her toddler was “already idolizing” Marlowe and “beaming every time she sees her.”
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Miller isn’t just a proud mom; she’s also a fan of her teenager’s emerging personal style. She has affectionately pointed out that their fashion senses differ, with Marlowe favoring a “clean girl aesthetic” that is “cool and really chic and quite 90s.” The two even share clothes, with Miller confessing she borrows her daughter’s “nice and cropped” jumpers. In a full-circle moment, Marlowe joined her mother on the red carpet at the 2024 Cannes Film Festival, offering a glimpse of the poised young woman she is becoming.
As Miller prepares for her new baby, she does so with the confidence of an experienced mother who has found her footing. She has passionately defended having children at any age, stating, “If your body is capable of it, have the baby… I’m a better mother now.” With Marlowe as a doting big sister, a toddler discovering the world, and a new baby on the way, Sienna Miller’s family is a testament to love blooming in its own time.
