Sienna Miller, 44, appears to have shared a significant clue regarding the gender of her third child, a son with fiancé Oli Green, 29. The actress took to Instagram on Friday, posting a series of family photographs from a summer holiday, which included an image of a three-month-old infant with a blue heart obscuring their face.

Miller announced the birth of her third child, her second with Green, in May, but the couple had not publicly disclosed the baby's gender until this recent post. She had previously shared that "It's happened. I have a tiny baby next door." The actress also has a 14-year-old daughter, Marlowe, from her previous relationship with Tom Sturridge.

Family Moments and Post-Birth Adjustments

The Instagram post featured the infant in a pram, alongside a makeup-free Miller reading to her daughter, whose face was covered with a red heart. Another photo captured Oli Green during the family's holiday. Miller had announced her pregnancy in December by revealing her baby bump at the Fashion Awards.

In May, Miller spoke about the challenges of returning to work just three weeks after giving birth, noting on The Tonight Show With Jimmy Fallon that she was surviving on "very little sleep." She described the transition of having a new baby as difficult, sharing anecdotes about a challenging transatlantic flight with her toddler and newborn.

"The toddler now wins hands down. It was an absolute disaster. There's no negotiating. I got to the immigration line and just broke down," Miller said, humorously contrasting the toddler's demands with the newborn's. She admitted that stringing sentences together was challenging due to sleep deprivation but expressed deep love for her baby.

Earlier posts from the past few weeks also showed glimpses of the family, under the caption "Adulting." These included photos of Miller cuddling her newborn in the hospital, a snapshot of her two-year-old daughter's curly hair, and an image of a pregnant Miller resting in bed. The photos suggested the couple had retreated to Green's childhood home shortly before the birth, with shelves in the background decorated with childhood photos of Oli, toys, and sports memorabilia. Oli Green was also pictured holding the baby in the hospital and pushing a pram near their London home.

Engagement and Public Life

In June, Miller's sister, Savannah Miller, confirmed the actress's engagement to Oli Green, praising Green's proposal as "beautiful." Rumors of the engagement had begun the week prior when Sienna Miller was seen wearing a diamond ring on her wedding finger.

The star also shared a close up snap of Oli, 29, as the family enjoyed a summer holiday together

Sienna hinted the couple have welcomed a son as she posted a snap of the three-month-old lying in a pram with a blue heart over their face

The group were also seen enjoying yoga in the sun as they relaxed during the summer holiday