Sienna Miller Welcomes Third Child With Boyfriend Oli Green

Actress Sienna Miller has welcomed her third child.

The 44-year-old star recently confirmed that she gave birth to a baby with her boyfriend, actor Oli Green, 29. The couple already share a 2-year-old daughter. Miller also has a 13-year-old daughter, Marlowe, with her former partner Tom Sturridge.

During an interview with E! News, Miller said, “I have a tiny baby next door.” She also joked that she is very tired while adjusting to life with a newborn, saying she is getting very little sleep but is “madly in love” with the baby.

Miller revealed she was expecting another child at the 2025 Fashion Awards in London in December, where she appeared on the red carpet wearing a sheer white dress.

Over the years, Miller has had several high-profile relationships. She was once engaged to actor Jude Law before they split in 2011. She later dated Tom Sturridge, and the two welcomed daughter Marlowe before separating in 2015. Miller was briefly engaged to art businessman Lucas Zwirner in 2020 before beginning a relationship with Green in 2022.

In past interviews, Miller has spoken openly about the 15-year age gap between her and Green. In a 2024 interview with Harper’s Bazaar, she said she did not plan to date someone younger but praised Green for being “wise and well-adjusted.”

She also said younger men today often show more respect toward women because they grew up in a more equal environment.

Earlier this year, Miller told Grazia magazine that relationships between older women and younger men are still treated differently by society. She said she hopes those views will change in the future.