Sienna Miller has shared the first snaps of her adorable newborn baby as she welcomes her second child with her partner Oli Green20:10, 01 Jul 2026Sienna Miller has shared the first snaps of her newborn child with her partner Oli Green. The actor, 44, revealed her pregnancy with her third child last December, then gave birth in May, and has now shared the emotional images leading up to her child's birth.‌Captioning the post, "Adulting," she shared a photograph of herself in bed with her swollen stomach exposed, seemingly just before giving birth.‌In another snap, her boyfriend Oli - who appeared in The Crown - could be seen crying as he held his child while topless, giving the youngster some skin to skin contact. Sienna could also be seen cuddling her newborn while in a hospital bed, while other images in the post showed the young family adjusting to normal life post-birth.‌Fans rushed to support the star with Celebrity Traitors star Paloma Faith commenting on her "Adulting" caption: "Don't be silly you are a teen mum like me ! Round three here toooooo!"Cat Deeley commented: "Gorgeous", while Laura Whitmore said: "Well done mama xx". Sadie Frost simply said: "Lovely."‌Announcing her child's birth, Sienna told E! News: “It’s happened. I have a tiny baby next door." Sienna is also mum to Marlowe, 13, with ex Tom Sturridge as well as another two-year-old daughter whose name has not been shared publicly with Oli, 29.“It feels like stringing sentences together is a bit challenging. I’m on very little sleep but I’m madly in love with my baby," she said at the time.‌The star has previously commented that she has found motherhood in her 40s much easier than the first time around when she gave birth to Marlowe.She told Glamour magazine: "Having had a baby at 29, and then having a baby at 42, and now 44, it’s so much easier when you don’t have the conflict of feeling scattered and like you want to be doing X, Y, Z."If I’m in bed at 9 p.m. with a book, I’m so happy now. And now I’ve got the excuse to do it. Life is in a more grounded space. I think the 30s are chaos.‌"You’re like, 'I want to settle down. I want kids.' By the time you hit 40, you’re like, 'I kind of know who I am and I don’t really give a s*** about what anyone else thinks.' I’m a much more grounded human. We don’t judge men who are having kids in their 80s. Why on earth is there any sort of narrative?"The star revealed four years ago when she was 40 that she made the decision to freeze her eggs in case she wanted to have children later in life."I’d invested what felt like the important years in something that was just a bucket with a hole in it of a person. I wasted time. And I felt like time was really my currency,” she told British Vogue in November 2022.Article continues below“There was a lot of anxiety. Relationships hadn’t worked out. I imagined that I would be married with three kids, being a great mum."Like this story? For more of the latest showbiz news and gossip, follow Mirror Celebs on TikTok , Snapchat , Instagram , Twitter , Facebook , YouTube and Threads .