Actress Sienna Miller and actor Oli Green have officially announced their engagement, marking a new milestone in a relationship that has quietly grown over the past four years. The news comes just weeks after the couple confirmed they had welcomed their second child together, making 2026 a year of major personal milestones for the pair.
Engagement speculation first began earlier this month when Miller was photographed during an outing in Barcelona wearing a prominent diamond ring on her left hand. While the images quickly fueled rumors online, those reports have now been confirmed by multiple entertainment outlets, which say the couple is officially planning to marry.
Miller, 44, and Green, 29, have been linked since early 2022 after they were first spotted together in New York before making their red carpet debut later that year. Despite their 15-year age difference, the couple has largely kept their relationship away from public attention, occasionally appearing together at film premieres and fashion events while avoiding the intense media spotlight that followed much of Miller’s earlier career.
Their relationship has evolved steadily over the past several years. In 2023, the couple announced they were expecting their first child together, welcoming a daughter in early 2024. Late last year, Miller revealed she was pregnant again, and in May 2026 she confirmed the arrival of their second child. Speaking shortly afterward, the actress joked about the sleepless nights of raising a newborn while describing herself as “madly in love” with her baby.
Green, an actor and model, has built a growing career with appearances in productions including The Crown, Lift, A Good Person, and Bridget Jones: Mad About the Boy. While Miller remains the more internationally recognized name, the couple have presented themselves as equal partners, often choosing privacy over publicity as they build their family together.
For Miller, the engagement represents another chapter in a life that has unfolded under public scrutiny for more than two decades. The actress, known for films including Layer Cake, Alfie, American Sniper, and the upcoming Jack Ryan: Ghost War, has previously spoken about finding happiness later in life and embracing motherhood on her own terms. Before her relationship with Green, she was engaged to actor Tom Sturridge, with whom she shares a daughter.
Neither Miller nor Green has publicly revealed wedding plans or a date for the ceremony. For now, the couple appear focused on celebrating their engagement while adjusting to life as parents of two young children. Their announcement has been warmly received by fans and colleagues, closing out a remarkable few months that have brought both a growing family and the promise of a wedding in the near future.
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