Sienna Miller confirms engagement to Oli Green after ring sighting in Spain

Sienna Miller’s engagement to Oli Green arrived the old-fashioned celebrity way: not with a formal reveal, but with a diamond ring catching the light on her left hand in Spain. For jewelry watchers, that matters because the image was unmistakable and almost disarmingly plain, a reminder that the most powerful engagement-ring signal is still the clearest one.

Us Weekly first noticed the ring on Thursday, June 4, when Miller was photographed out in Spain wearing jeans, a black shirt and a jacket draped over her shoulders. Her hands were held in front of her, putting the diamond ring squarely in view. E! News later confirmed the jewelry was an engagement ring, and confirmed the engagement on June 9.

The timing adds weight to the sighting. Miller and Green have been linked since early 2022 and made their red-carpet debut in April 2022. E! News said the couple had been together for four years and had recently welcomed their second baby together, after Miller revealed in an exclusive interview that the child arrived on May 11, 2026. Miller has three children in all, including her 13-year-old daughter Marlowe with ex-fiancé Tom Sturridge.

The ring itself has not been described in terms of cut, setting or carat weight, which is part of its appeal as a market signal. There is no elaborate fashion statement here, no colored stone, no unusual mounting and no overtly avant-garde silhouette in the public view. Instead, the engagement lands in the most commercially reliable lane in celebrity jewelry: a simple diamond ring worn on the left hand, legible at a glance and easy for audiences to read as commitment, not costume.

That restraint also fits the wider conversation around Miller’s relationship. In March 2026, she publicly defended relationships between older women and younger men, saying they are often fetishized rather than normalized. With Miller 44 and Green 29, the 15-year age gap has drawn attention, but the ring sighting shifts the focus back to the jewelry itself, where understatement often outperforms spectacle.

If there is a next-wave lesson in this engagement, it is not about novelty for novelty’s sake. It is that a clean, readable diamond ring, worn in real life and not staged as a grand unveil, still carries the most influence.