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has said an older woman being in a relationship with a younger man is 'still fetishised' amid her romance with Oli Green.
There is a 15-year age gap between the actress, 44, and her partner, 29, who welcomed a daughter together in 2023. Sienna is pregnant with their second child.
Speaking to Grazia, Sienna recalled the early days of her acting career and how she once auditioned to play the love interest of a 45-year-old actor when she was 21.
She said: 'Things have moved on since then, but the idea of an older woman with a younger man, for example, is still fetishised rather than normalised - there's a disparity there that I would love to see disappear.'
Sienna and Oli first began dating in 2021. He is also an actor and has starred alongside and in 2023's A Good Person, and Imelda Staunton and Dominic West, in an episode of the same year.
The actress, who announced her current pregnancy when she debuted her baby bump at The Fashion Awards in December, also discussed her cravings.
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Sienna Miller has said an older woman being in a relationship with a younger man is 'still fetishised' amid her romance with Oli Green (pictured in December 2025)
'I'm hooked on vinegary things at the moment,' she said, adding that she has also been indulging in a lot of peanut butter and jam on toast.
Sienna lamented having to go through another round of postpartum hair loss.
'It's these bits,' she said, twirling a few hairs around her fingers. 'They're just starting to grow back properly and now it's all going to go again.'
Sienna said she is looking forward to taking time off this year and spending more time with her children. She is also mother to daughter Marlowe, 13, with her ex Tom Sturridge.
Speaking previously about Oli, Sienna told Harper's Bazaar: 'I didn't expect to take it seriously and then quite quickly, I fell in love.
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'I wasn't like, "I'm gonna get a younger boyfriend." It was more, "F***! Why are you young? That's so annoying."
'There is a difference in the way that generation of men respect women. It's specific to him, he is very wise and well-adjusted, but I do believe it's also that generation.
'They have grown up with a slightly more level playing field. I see it in his female friends as well as in the men.'
There is a 15-year age gap between the actress, 44, and her partner, 29, who welcomed a daughter together in 2023 (pictured together in 2023)
Sienna dated Tom Sturridge, 40, for four years and split in 2015. They are still on good terms, with Sienna calling Tom her 'best friend' whilst they co-parent Marlowe.
Sienna's breakthrough roles came 20 years ago in Layer Cake and Alfie but she somewhat dropped off the radar for years after that, before 2024 saw her marked career resurgence and return to the movie spotlight.
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in summer 2024, just five months after giving birth, she stole the show during where she promoted her new movie - 's western epic, Horizon: An American Saga.
Sienna's performance in the film was one of its few critical high points, with many reviewers praising her compelling portrayal of Frances Kittredge amidst the film's mixed reception.
She was specifically noted for her 'impeccable American accent' in the role while Time magazine called Sienna 'far and away the best thing' about the project.
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