Sienna Miller welcomes third child at 44 with partner OIi Green: 'Madly in love'

Former It girl Sienna Miller has announced the birth of her third child – her second with partner of five years Oli Green.

Miller, 44, who announced her latest pregnancy by appearing on a red carpet with her baby bump on display, revealed she had become a mother again while promoting her new film, Jack Ryan: Ghost War.

Miller was asked if she was "about to have another" when she replied, "It's happened. I have a tiny baby next door," she told E! News.

Watch the video above.

"I feel slightly like stringing sentences together is challenging... I'm on very little sleep, but I'm madly in love with my third baby." 

The baby, whose date of birth or sex was not revealed, is Miller's second child with Green.

She also has a daughter, Marlow, 13, with British actor Tom Sturridge.

Miller met Green, who is 14 years her junior, at a friend's Halloween party in 2021.

READ MORE: Where Keith stands with daughters after split

READ MORE: Tom Brady takes brutal swipe at Kevin Hart

READ MORE: Aussie star denied US entry, tour cancelled

She told Harper's Bazaar in 2024 she did not plan to fall for someone who was so much younger than herself.

"I didn't expect to take it seriously and then quite quickly, I fell in love. I wasn't like, 'I'm gonna get a younger boyfriend.' It was more, 'Why are you young? That's so annoying'."

They went public with their relationship in February 2022, when Miller and the model-turned-actor attended a New York Knicks game.

In 2023, reports emerged that Miller was pregnant with their first child. Miller gave birth to a girl in January 2024, and later described her arrival as a "cathartic, healing experience".

"I'm in heaven," she said.

It was revealed Miller was expecting again in December when she appeared on a red carpet wearing a see-through dress with Green by her side. 

Miller got her big break in the 2004 film Alfie.

It was during filming that she fell for her co-star Jude Law, who was nine years her junior and going through a divorce from wife Sadie Frost.

For a daily dose of 9honey, subscribe to our newsletter here.

They got engaged on Christmas Day 2004, but just five months later reports emerged he had cheated on Miller with his children's nanny.

They split in 2006 but got back together in 2009 before splitting for good two years later.

She reportedly went on to date actors Matthew Rhys and Notting Hill star Rhys Ifans and reportedly had affairs with actors Daniel Craig and Balthazar Getty before meeting Sturridge in 2011.

They became engaged the following year and welcomed Marlowe in July 2012 but broke up three years later.

She later became engaged for a third time to literary editor Lucas Zwirner. After they split, she briefly dated businessman Archie Keswick before meeting Green.

FOLLOW US ON WHATSAPP HERE: Stay across all the latest in celebrity, lifestyle and opinion via our WhatsApp channel. No comments, no algorithm and nobody can see your private details.