At the Royal Albert Hall in London, United Kingdom, on December 1, 2025, Sienna Miller, 43, revealed her third pregnancy on the red carpet of the 2025 Fashion Awards in a transparent Givenchy dress with manifesto-like qualities. Alongside Oli Green, the actress turns a celebrity pregnancy into a societal topic: motherhood after 40, age norms, and representations. What do statistics and doctors say about this growing delay?
On the red carpet, a well-orchestrated staging
December 1, 2025, Royal Albert Hall in London. At the 2025 Fashion Awards, Sienna Miller appears in a transparent white dress by Givenchy (SS 2026, artistic direction: Sarah Burton). Empire waist, airy tulle, confidently worn white underwear: the actress offers the camera a clearly visible Sienna Miller baby bump. No statement needed: the image suffices. On the arm of Oli Green (28 years old), Sienna Miller’s partner, she thus seals, on a red carpet that has become a media in its own right, the announcement of her third pregnancy – second child with her partner.
With her boho chic look (wavy hair, discreet makeup, dangling earrings), the Briton claims a fashion language she has mastered since her beginnings: transparency not as provocation, but as self-affirmation. This aesthetic, much commented on in the fashion press, feeds another trend: the rise of the naked dress and naked dresses as well as embraced pregnancy looks on the red carpet.
A personal and stylistic trajectory
Revealed in cinema and on stage, Sienna Miller (43 years old) is already the mother of Marlowe (born in 2012 from her relationship with Tom Sturridge). With Oli Green, whom she met in 2022, she welcomed a little girl late 2023 / early 2024 (the couple has not disclosed a precise date or name). The new pregnancy fits into an intimate timeline that the actress has sometimes mentioned. She feels the pressure of the biological clock after 40. Additionally, she decides to freeze eggs. Furthermore, she wishes to defy age injunctions that weigh on women.
Stylistically, the London scene responds to a significant precedent: during Vogue World: London in September 2023, Miller had already showcased her round belly in a spectacular look. This dialogue between fashion and motherhood traces a red thread: making visibility a lever for personal narrative, sometimes subversive.
Pregnancy after 40: what the numbers say
Beyond the glamour of the 2025 Fashion Awards, Sienna Miller’s trajectory resonates with a well-documented demographic evolution. In France, the average age at childbirth continues to rise, reaching 31.2 years in 2024 (provisional data). The average age at first child is 29.1 years in 2023, confirming the postponement of motherhood. Across the European Union, the average age at first child is 29.8 years in 2023. However, there are significant disparities between countries.
In this context, motherhood after 40 is no longer marginal. In 2019, 5.7% of births involved mothers aged 40 or older in France. Recent obstetric studies show a continuous increase in this share, around 5% to 6% in the early 2020s. Moreover, an estimate of 6.5% in 2022 is cited in medical literature.
This dynamic is not just a matter of individual choices; it is due to structural factors: longer studies, precarious early careers, housing costs, marital instability, and access to fertility preservation techniques (such as egg freezing). It also fits into a general decline in birth rates in Europe. However, France remains one of the most fertile countries.
What medicine reminds us: risks and monitoring
Specialists note that pregnancies beyond 40 are more frequent than thirty years ago. Moreover, these pregnancies are now better monitored. However, they remain statistically riskier. Without dramatization, it is important to recall the additional risks: gestational diabetes, pregnancy-induced hypertension / pre-eclampsia, growth retardation, prematurity, more likely cesarean section. The information should remain general, without extrapolating to an individual’s case. Professional and institutional reference sources detail these elements. They emphasize the importance of appropriate obstetric monitoring. Additionally, they highlight the importance of metabolic monitoring. Furthermore, they recommend personalized care.
In the public debate, a balance is needed: not over-medicalizing successful late maternity journeys, while reminding that obstetric risk increases with age. Health actors encourage clear information, pre-conception consultations when the child project is considered late, and close monitoring during pregnancy.
Representations and realities: the celebrity prism
The visibility of Sienna Miller adds to other publicized trajectories – Virginie Effira (46 years old, childbirth in August 2023), Janet Jackson (50 years old in 2017). These stories create a positive imagery of late motherhood: assertion of the body, control of the timeline, freedom to decide. But they also reflect privileges: access to expert medical teams, reproductive technologies, time, and resources that not all women can mobilize.
Hence the need for a political and general information (IPG) media to distinguish what inspires from the daily life experienced by the majority. Yes, the age norm is shifting; no, the social reality does not erase inequalities in access to care, prevention, leave, or even egg freezing (very costly outside medical indications in several countries).
Fashion, body, society: what a transparent dress changes
On stage, Miller rewrites the vocabulary of the maternity dress: here, no wrap-around or strategic fullness, but a transparency that assumes and claims. The transparent Givenchy dress – signed Sarah Burton, whose arrival at the artistic direction has reoriented the house’s aesthetic – evokes both femininity and a contemporary view on motherhood.
Does this gesture influence fashion? In the short term, it accelerates existing trends: naked dresses, visible underwear, light colors, empire silhouettes. In the medium term, it is part of a movement where motherhood becomes representable differently: neither sanctified, nor hidden. The question remains: does this symbolic reconfiguration benefit the majority? It can help normalize pregnancy at work or in public spaces; it does not replace social policies (support for parenting, reproductive health, fight against age and gender biases).
Box: key figures to remember
- 31.2 years: average age at childbirth in France in 2024 (provisional).
- 29.1 years: average age of mothers at first child in 2023 (France).
- 29.8 years: average age at first child in the EU in 2023.
- 5.7% of births in 2019 in France involve mothers aged 40 or older (around 5–6% since).
Chronological milestones
- 2012: birth of Marlowe, eldest daughter of Sienna Miller and Tom Sturridge.
- 2022: start of the Sienna Miller / Oli Green relationship.
- Late 2023 / early 2024: birth of the couple’s first daughter (name not disclosed).
- December 1, 2025: 2025 Fashion Awards at the Royal Albert Hall in London; Sienna Miller reveals her third pregnancy in a transparent Givenchy dress (collection SS 2026).
Beyond celebrity: a societal debate
Sienna Miller’s appearance in London is not a celebrity interlude. She stages a life moment and, in doing so, reminds of a significant trend: later motherhood in European societies. She invites discussions on fashion, body, representations, but also public policies. Celebrity does not exhaust the question; it makes it visible: at 43, under a transparent dress, a famous woman poses, without a word, the terms of a debate that the IPG must continue to document.