Celebrity Parents Sienna Miller Welcomes Baby Girl with Boyfriend Oli Green The couple was spotted strolling with their infant in West London By Angela Andaloro Angela Andaloro Angela Andaloro is a Society & Culture Staff Writer at PEOPLE. She has been working at PEOPLE since 2022. Her work has previously appeared on BuzzFeed, Entertainment Weekly, and LittleThings. People Editorial Guidelines Published on January 3, 2024 10:51AM EST Close Sienna Miller and Oli Green. Photo: PA Images/Alamy Sienna Miller has welcomed her little one! The American Woman actress, 41, welcomed a baby girl with boyfriend Oli Green, The Daily Mail reports after photos surfaced of Miller on a stroll with her infant and Green. The newly minted mom of two smiles while wearing her newborn baby in a carrier, holding her close as the three walked through West London. Miller is already mom to daughter Marlowe, 11, whom she shares with actor Tom Sturridge. Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of what PEOPLE has to offer, from juicy celebrity news to compelling human interest stories. Savannah Miller and Sienna Miller. Jed Cullen/Dave Benett/Getty Sienna Miller Is Pregnant! Actress Expecting Second Baby as She Shows Off Bump While on Vacation (Exclusive) While speaking with Vogue for their December cover issue, the actress opened up about having a baby later in life, saying that she isn't exempt from her own insecurities. "I'd love to get to a point where I didn't feel the need to make a joke of my being older and having a baby," she told the outlet. "To show I'm in on the joke." She went on to discuss her iconic belly-baring look at Vogue World in September, saying that she was "nervous about the idea of it, but once I had it on, everything else felt boring. I was like, 'I'll have that photo for the rest of my baby's life.' " "It's kind of fascinating to fight your own prejudice against yourself. I'm constantly doing that." Sienna Miller. Jed Cullen/Dave Benett/Gett News of the actress and fashion icon's second pregnancy first surfaced when Miller was photographed on the beach in Ibiza, wearing a brown two-piece bikini that showed her bump. Before her vacation in Ibiza, Miller was spotted spending time in St. Tropez with Green. The actress has been dating her 26-year-old boyfriend since 2022 and has previously opened up about the "pressure" to grow her family after turning 40. Oli Green and Sienna Miller. Stephane Cardinale - Corbis/Corbis via Getty In a 2022 interview with Elle UK, she discussed the topic and revealed that she’d had some of her eggs frozen. "[The] pressure... [about] kids, and should I have more, and why haven’t I, and all of that, which is a really loud noise. Biology is incredibly cruel on women in that decade – that’s the headline, or it certainly was for me," she shared. "Then I got to 40 and I froze some eggs. Having been really focused on the need to have another baby, I’m just like, if it happens, it happens. That kind of existential threat has dissipated."