Sienna Miller is expecting baby number three

Actress Sienna Miller is pregnant with her third child, and her second with partner Oli Green. In a recent interview published March 23, she made it clear she thinks having children in her 40s is actually a win.

Why she thinks later parenting is better

Miller compared her experience across decades. She had a child at 29, then at 42, and now at 44. Her takeaway: being older made parenthood easier. She said the 30s felt chaotic and full of indecision. At 40 plus she says she knows herself better, cares less about what others think, and feels more settled.

Her small pleasures get upgraded by parenthood at this stage. If she is in bed reading by 9 p.m. she feels content and even justified. She called getting pregnant while older a kind of “biohack,” noting the physical rush of pregnancy hormones and blood as something she’s enjoying.

Practical steps and personal notes

Miller also shared that she froze her eggs to boost the chance of another pregnancy. That precaution, she said, provided “existential relief” when she did conceive in her late 30s.

She’s also spoken publicly about her relationship with Oli Green, who is 14 years younger. Miller has described their partnership as full of love and joy and dismissed the idea you can control feelings with rules.

She’s part of a bigger trend

Sienna’s story is far from unique in celebrity circles. Plenty of public figures have had children in their 40s or later. Here are some notable examples:

  • Gisele Bündchen welcomed a son at 44 in early 2025 and later married Joaquim Valente.
  • Hilary Swank became a mom to twins, Aya and Ohm, at 48 in 2023. She had previously frozen her eggs.
  • Claire Danes was surprised to learn she was expecting a third child at about 44; daughter Shay arrived in 2023.
  • Gwen Stefani gave birth to Apollo at 44 and has described that pregnancy as a gift.
  • Jennifer Love Hewitt announced her third pregnancy at age 42 in 2021.
  • Milla Jovovich faced mixed emotions when pregnant at 43; son Osian was born in February 2020.
  • Alanis Morissette welcomed daughter Winter at 44 in 2019.
  • Rashida Jones quietly became a first-time mom at 42 in 2018.
  • Janet Jackson had her son Eissa at 49 in early 2017.
  • Eva Longoria gave birth to son Santi at 43 in 2018.
  • Nicole Kidman had daughter Sunday at 41 in 2008 and later added another child via surrogate.
  • Halle Berry welcomed daughter Nahla at 41 and a second child in 2013.
  • Madonna was nearly 42 when son Rocco was born in 2000.
  • Marcia Cross gave birth to twins just before turning 45 in 2007.
  • Rachel Weisz and Daniel Craig announced their first child together when she was 48 in 2018; daughter Grace arrived that year.
  • Brigitte Nielsen revealed a fifth child at age 54 in 2018.

These examples show a range of ages and experiences. Some pregnancies followed fertility interventions like egg freezing. Others were natural surprises. Together they underline that people become parents at many stages and that later parenthood can feel very different from earlier experiences.

Bottom line

Sienna Miller’s message is simple: later-in-life parenting can be calmer and more self-aware. She has taken steps to protect her fertility, embraced aging, and found comfort in contradictory-sounding facts like feeling younger while being older. Whether you agree or not, the celebrity examples make it clear that the timeline for building a family is not one size fits all.