Is Sienna Miller pregnant? Who is Sienna Miller’s boyfriend? Here’s what to know

Sienna Miller is celebrating a very special moment in style. The 43-year-old actress revealed her pregnancy at the 2025 Fashion Awards, held at London’s Royal Albert Hall, turning heads as she walked the red carpet. Miller showcased her baby bump in a sheer white gown layered over white shorts, her loose waves and statement earrings completing a look that was equal parts ethereal and effortlessly chic.

This will be Miller’s third child. She and boyfriend Oli Green welcomed a daughter at the end of 2023, and Miller is also mom to 13-year-old Marlowe, whom she shares with ex-partner Tom Sturridge. A representative for the actress did not immediately respond to requests for comment.

Miller’s pregnancy reveal comes after years of candid discussions about family planning and the challenges of having children later in life. In a 2022 Elle UK interview, she spoke openly about the pressures she faced regarding motherhood, including freezing some of her eggs:

“[The] pressure… [about] kids, and should I have more, and why haven’t I, and all of that, which is a really loud noise. Biology is incredibly cruel on women in that decade – that’s the headline, or it certainly was for me,” she explained.

“Then I got to 40 and I froze some eggs. Having been really focused on the need to have another baby, I’m just like, if it happens, it happens. That kind of existential threat has dissipated.”

In addition to these personal revelations, Miller has been sharing her journey as a mother and balancing public appearances. Earlier this year, she attended her sister Savannah Miller’s Bridal Ballerina Breakfast in London with her daughter Marlowe. Photographs from the event showed the pair smiling together, with both sporting long, wavy hairstyles—a visual reminder of the mother-daughter resemblance.

Miller and Green, 28, have been dating since 2022, and the couple appears more radiant than ever in public appearances. While Miller has kept a relatively low profile recently, her pregnancy reveal at the Fashion Awards signals both a personal milestone and a savvy moment of public engagement.

The actress’ fashion choices for the evening did not disappoint. For the 2025 Fashion Awards, Miller wore a gown from Sarah Burton’s Spring 2026 Givenchy collection, pairing sheer elegance with her signature boho-meets-rock-chic style. Fans and fashion commentators have long admired her ability to blend effortless glamour with a natural, approachable aesthetic—proving yet again why she remains a trendsetter.

This isn’t Miller’s first memorable pregnancy red carpet moment. At Vogue World: London 2023, she made waves in a Schiaparelli puffball skirt and cropped top ensemble, which quickly became a standout look of the night. Her fashion choices have consistently inspired fans to embrace pregnancy style beyond traditional maternity wear.

At the Royal Albert Hall, Miller’s presence reminded everyone why she continues to set trends in fashion and lifestyle. From cork wedges to ethereal gowns, her influence remains undeniable—particularly when it comes to maternity looks that exude confidence and individuality.

With this third pregnancy, Miller adds another chapter to her journey as a mother while continuing to make a mark in both Hollywood and the fashion world. Fans and followers can undoubtedly expect a surge of interest in her signature pregnancy glow and her effortlessly chic style.

FAQ

Q: How many children does Sienna Miller have?
A: Miller is expecting her third child. She has two daughters: Marlowe, 13, with Tom Sturridge, and a younger daughter with boyfriend Oli Green.

Q: Who is Sienna Miller’s boyfriend?
A: Her partner is Oli Green, 28, and they’ve been together since 2022.

Q: When did Miller reveal her pregnancy?
A: She revealed her pregnancy at the 2025 Fashion Awards on December 1 at London’s Royal Albert Hall.

Q: Has Miller spoken about having children later in life?
A: Yes, she has openly discussed the pressures of motherhood after 40 and her decision to freeze some eggs.

Q: What was Miller wearing at the Fashion Awards?
A: She wore a sheer white gown from Sarah Burton’s Spring 2026 Givenchy collection, layered over white shorts, with wavy hair and statement earrings.