Summary (tl;dr)

Actress Sienna Miller, 43, is trending after she publicly announced her third pregnancy, her second with partner Oli Green, at the 2025 Fashion Awards in London, making headlines with her revealing red-carpet attire.

Essential Background

Sienna Miller is an acclaimed American-British actress and model with a notable career in film and fashion. She is already a mother to a 13-year-old daughter, Marlowe, from a previous relationship, and welcomed a daughter with her current partner, Oli Green, in early 2024. Miller has previously been vocal about the "pressure" surrounding motherhood in her 40s and openly shared her decision to freeze her eggs.

The Full Story

On December 1, 2025, Sienna Miller, aged 43, revealed she is expecting her third child at the 2025 Fashion Awards held at the Royal Albert Hall in London, England. She made the announcement by debuting her baby bump in a sheer white Givenchy gown from the Spring/Summer 2026 collection as she walked the red carpet alongside her partner, Oli Green. This will be her second child with Green, whom she has been dating since 2022. The public reveal, celebrated for its stylish and bold nature, quickly became a significant talking point in entertainment and fashion circles.

Why It Matters

Sienna Miller's pregnancy announcement at 43 is significant as it contributes to wider discussions about age, fertility, and societal expectations for women, particularly in the public eye. Her previous candid statements about the "existential threat" and "cruelty of biology" for women in their 40s seeking to expand their families, alongside her decision to freeze her eggs, resonate with many navigating similar personal journeys. The stylish manner of her announcement at a high-profile fashion event also reinforces her influence in beauty and fashion, drawing attention to designers and trends.

Geographic Location

• Royal Albert Hall, London, England, United Kingdom (2025 Fashion Awards where Sienna Miller announced her pregnancy)