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Sienna Miller Welcomes Baby No. 3, Her 2nd With Boyfriend Oli Green
Sienna Miller has added a new agent to her mission.
The G.I. Joe actress revealed she welcomed her third baby, and second with boyfriend Oli Green.
“It’s happened,” Sienna told E! News’ Will Marfuggi in an exclusive interview. “I have a tiny baby next door.”
Indeed, the American Sniper actress—who is mom to Marlowe, 13, with ex Tom Sturridge as well as another 2-year-old daughter whose name has not been shared publicly with Oli—admitted it’s been an adjustment to becoming a blended family of five after she and Oli announced her pregnancy late last year.
“It feels like stringing sentences together is a bit challenging,” she joked. “I’m on very little sleep but I’m madly in love with my baby.”
Of course, being a mom of three isn’t the only new chapter Sienna is embarking on. After all, she is set to star in Tom Clancy’s Jack Ryan: Ghost War later this month, which is a follow-up to the television series that ended in 2023.
“I loved it,” the 44-year-old said of signing on to play M16 officer Emma Marlowe opposite titular star John Krasinski in the movie. “I haven’t done anything really like this before and to play someone who is incredibly unapologetic, incredibly tough and bold and brave and pretty funny and dry and very cool—it was thrilling.”
And Sienna’s costar couldn’t help but heap praise on her ability to dive headfirst into the world he’s been living in since 2018.
Lia Toby/Getty Images
“I don’t know if this movie happens if Sienna said no,” John mused to E!, "because we had written the part for her and I just knew we’d be so lucky to not only get who I think is one of the best actors working but I didn’t know she was one of the funniest people on planet Earth.”
As he put it, “To be in these pressure cooker situations doing stunts but wiping tears of laughter away right before you do them was extremely helpful.”
Unfortunately for Sienna, though, not everyone was impressed. Despite her character being named after her 13-year-old, she admitted that her eldest daughter “couldn’t be less interested in my career if I tried.”
However, she has hope once the film finally hits Prime Video May 20, she may win Marlowe over.
“I thought people calling me ‘Agent Marlowe’ would hook her,” she explained. “So maybe she’ll finally watch a film of mine.”
For more stars who have welcomed babies this year, keep reading…
Dimitrios Kambouris/Getty Images for REFORM Alliance
Cameron Diaz & Benji Madden
The Good Charlotte rocker announced on May 4 that he and wife Cameron—who share daughter Raddix and son Cardinal—have welcomed their third child together, a baby boy named Nautas Madden.
Photo by Eric Charbonneau/Paramount Pictures via Getty Images
Rebel Wilson & Ramona Agruma
The Pitch Perfect alum announced May 4 that she and the fashion designer—who share daughter Royce—welcomed their second baby together, a little girl named Rose Estelle.
“Now on May 4th it’s now 4 of us!” she wrote on Instagram. “Ramona and I are feeling so incredibly grateful and blessed to grow our family, thank you everyone for all the well wishes.”
Tommaso Boddi/FilmMagic
Allison Kuch & Isaac Rochell
The couple confirmed the arrival of their second baby in an April 22 announcement.
"Our sweet baby girl is here!! Pepper Jo," they wrote on Instagram, Allison adding, "One of the best days of our lives and the vbac [vaginal birth after cesarean] of my dreams!"
Freddie Freeman/Instagram
Freddie Freeman & Chelsea Freeman
The Los Angeles Dodgers player and his wife expanded their team with the arrival of daughter London Rosemary Joy Freeman on April 19.
Instagram/Jasmin Lawrence
Eric Murphy & Jasmin Lawrence
Eddie Murphy confirmed to E! News that his son had welcomed a daughter named Ari Skye with Jasmin, who's dad is comedian Martin Lawrence.
"They just had a baby girl," he said in an April 18 interview. "They just had her two weeks ago, or a week ago."
Stefania D'Alessandro/WireImage
Justin Theroux & Nicole Brydon Bloom
The Running Point actor and the Paradise actress welcomed their first child, a baby boy. The couple announced on Instagram April 18, "He's here."
Joey Lawrence/Instagram
Joey Lawrence & Samantha Cope
Nearly two years after calling off their divorce, the Blossom alum's wife gave birth to their second baby together. The couple named their son Ford Joseph Lawrence.
Michael Trevino & Bregje Heinen
Michael Trevino & Bregje Heinen Trevino
The Vampire Diaries alum and the model announced they welcomed their first child, Jack Wild Trevino, in a joint Instagram post on April 6.
Along with announcing their son's name, the couple—who tied the knot in June 2025—shared a black and white photo of their hands intertwined with their newborn's.
Becca Kufrin/Instagram
Becca Kufrin & Thomas Jacobs
Paradise became a little bigger for the Bachelor Nation stars when their second child—a baby boy named Steven Jon—was born on April 5.
Mike Mulholland/Getty Images
Scottie Scheffler & Meredith Scheffler
The former Masters tournament winner and his wife welcomed their second baby boy, Remy, March 27. The couple also share toddler Bennett, whom they welcomed in 2024.
As Scottie told the Golf Channel during the Masters tournament in April, “We had another boy a couple of weeks ago, and, yeah, it's been really nice and fun."
Michael Loccisano/Getty Images)
Hailee Steinfeld and Josh Allen
The Sinners star and NFL quarterback announced the birth of their first child together on April 2.
“Our baby girl has arrived!!” the couple wrote on Hailee's Beau Society Substack. “We’re feeling incredibly grateful and blessed and savouring these early moments. Thank you so much for the love and well wishes.”
Michael Kovac/Getty Images for Baby2Baby
Charlie Puth & Brooke Sansone Puth
The "We Don't Talk Anymore" singer and his wife announced on March 23 that they had welcomed their first baby together, a baby boy named Jude.
LISA O'CONNOR / AFP via Getty Images
Sofia Richie and Elliot Grainge
The daughter of Lionel Richie and record executive welcomed their second baby together, Henry Cecil Grainge, on March 18.
Sofia announced the exciting news with a March 25 Instagram post featuring an adorable snap of their newborn with their daughter Eloise.
Carly Rae Jepsen/Instagram
Carly Rae Jepsen & Cole M.G.N
After announcing her pregnancy in November 2025, the "Call Me Maybe" singer confirmed she and her husband welcomed their first baby together in an Instagram Story March 17.
Peter Kraus and Hana Ostapchuk
The Bachelorette alum and his wife welcomed their first baby together on March 14.
"Our sweet Andie girl is here,” Hana captioned the couple’s March 17 joint Instagram post announcing their little one’s birth. “Born on Saturday afternoon, just hours before the biggest blizzard of the season—just as it was almost 40 years ago on Peter’s birthday.”
Javi Marroquin/Instagram
Javi Marroquin & Lauren Marroquin
The Teen Mom alum, who shares son Lincoln with ex Kailyn Lowry, expanded his blended family when his wife gave birth to a baby boy.
"The best surprise of our lives," he and Lauren—already parents to kids Eli and Maizee—wrote on Instagram March 11, "& the sweetest grand finale."
Instagram/Kat Graham
Kat Graham & Bryant Wood
On March 12, the Vampire Diaries alum announced the birth of her first child—a baby boy—with her husband. Sharing her son's Shakespearean name, she wrote on Insatgram, "Welcome to the world Prospero 'Spero' Nyemah Wood."
Jack Osbourne/Instagram
Jack Osbourne & Aree Gearhart Osbourne
The son of the late Ozzy Osbourne announced on Instagram that he and his wife welcomed their second daughter—his fifth—on March 5 and named her Ozzy Matilda Osbourne after the Black Sabbath frontman.
Luigi Iorio/GC Images
Ellie Goulding & Beau Minniear
The "Lights" singer confirmed she and her boyfriend had welcomed their first baby together in March.
As Ellie—who also shares son Arthur with ex Caspar Jopling—wrote in an Instagram Story, "We are totally obsessed with her.”
Camille Summers-Valli/Instagram
Charles Melton & Camille Summers-Valli
The Riverdale alum confirmed on March 9 that he had welcomed his first baby with the music video director, sharing photos of the newborn on Instagram.
Mary Kate Robertson/Instagram
John Luke Robertson & Mary Kate Robertson
The Duck Dynasty couple welcomed twin girls Sylvie and Francie on Feb. 24, bumping up their total of kids to five.
Instagram/John-David Duggar and Abbie Duggar
John-David Duggar & Abbie Duggar
Counting on, indeed. The 19 Kids and Counting and his wife welcomed their third baby—a girl—in February.
Instagram/Thomas Rhett
Thomas Rhett & Lauren Akins
Ain't it funny how life changes? The country music star announced in late February that his wife gave birth to their fifth child, a baby boy named Brave Elijah Akins.
Photo by John Nacion/Getty Images
Paul Anthony Kelly & Syd Widziszewski-Kelly
The Love Story actor confirmed that he and his wife had welcomed their first baby together, joking on the Feb. 23 episode of The Kelly Clarkson Show that being tired is "an understatement, for sure."
Taylor Hill/WireImage
Luke Combs & Nicole Hocking Combs
The "Better Together" singer and his wife welcomed their third baby, Chet Wiley Combs, in early February.
Patrick Adams/Instagram
Troian Bellisario & Patrick Adams
The Pretty Little Liars actress and Suits alum announced they had welcomed their third baby together on Jan. 27.
Patrick shared a photo of his newborn's hand in his own, which he captioned, "Tag. You're it."
Photo by Michael Tran/FilmMagic
Mario & Esmeralda Rios
The “Let Me Love You” singer (born Mario Barrett) announced Jan. 26 that he welcomed a baby boy with his girlfriend.
"Doctor Barrett,” the singer captioned a selfie wearing surgical scrubs on Instagram Stories. "Women are God’s greatest creation cuz what I [witnessed] today was ONLY GODS work!"
The R&B singer added, "Healthy baby boy!”
Emily Maynard Johnson/Instagram
Ricki Hendrick, Daughter of Bachelorette's Emily Maynard
The daughter of former Bachelorette star Emily Maynard Johnson and late race car driver Ricky Hendrick announced Jan. 23 that she had given birth to her first child, a baby girl named Romi.
The 20-year-old shared a picture on Instagram of her face nuzzled up to the newborn moments after delivery, simply writing in the caption, "Best day ever."
Photo by Michael Regan/Getty Images
Perrie Edwards & Alex Oxlade-Chamberlain
The Little Mix singer revealed on Jan. 17 that she and fiancé Alex Oxlade-Chamberlain had welcomed their second child together, a baby girl named Alanis Valentine.
Astrid Stawiarz/Getty Images
Lo Bosworth & Dom Natale
The Hills alum, who announced in July that she had tied the knot with the businessman and was expecting their first baby together, revealed on Jan. 15 that she had given birth to a daughter named Nelle.
“Our girl Nelle is here,” Lo captioned the Instagram post. “She started the year by surprising us two weeks early, but really, she was right on time. Our teeny one is named for her Oma and already so loved.”
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