Sienna Miller and Cate Blanchett put on similarly sophisticated displays on Monday, as they attended the screening of short film, Marion, at Soho House in London.
The two actresses both served as executive producers on the project, which was written and directed by .
Sienna, 42, looked the epitome of elegance in a tiger striped waistcoat, which she teamed with a matching blazer and trousers.
She added a gold statement necklace and black patent leather shoes, while styling her blonde hair in loose waves and sporting minimal makeup to showcase her natural beauty.
The Horizon star was joined by her boyfriend Oli Green, who opted for a plain white T-shirt and grey jeans, with a matching denim jacket.
The couple welcomed their first child together – a daughter – last December, while Sienna is also mother to 12-year-old daughter Marlowe, from her previous relationship with actor Tom Sturridge.

Sienna Miller and Cate Blanchett put on similarly sophisticated displays on Monday, as they attended the screening of short film, Marion, at Soho House in London (pictured with Finn Constantine and Joe Weiland)

Sienna, 42, looked the epitome of elegance in a tiger striped waistcoat, which she teamed with a matching blazer and trousers
Meanwhile Cate, 55, looked as radiant as ever, wearing a timeless red belted jacket layered over a matching turtleneck jumper.
And to add a casual touch to her ensemble, the Oscar-winning actress donned a pair of simple blue jeans and white trainers.
While she completed the effortlessly stylish look by sweeping her blonde hair up into a messy updo and sporting bejewelled aviator glasses.
Marion’s writer-directors Joe and Finn both posed alongside executive producers Cate and Sienna at the reception.
The short film follows France’s only female bull jumper in the tense 15 minute lead-up to her first performance in a packed arena.
The synopsis reads: ‘As Marion prepares, being the only woman in the team, the film explores her battle against misogyny and prejudiced attitudes.
‘A journey of one woman through an all-male world – juggling motherhood and the contentious pursuit of her passion. The film blends fiction and reality, creating a captivating thirteen minutes of tension.’
Cate previously admitted to Deadline that she couldn’t resist jumping onboard the film, saying that after first watching it she was ‘literally flown back in my seat’.

She added a gold statement necklace and black patent leather shoes, while styling her blonde hair in loose waves and sporting minimal makeup to showcase her natural beauty

The Horizon star was joined by her boyfriend Oli Green, who opted for a plain white T-shirt and grey jeans, with a matching denim jacket (pictured with Paul Weiland)

Meanwhile Cate, 55, looked as radiant as ever, wearing a timeless red belted jacket layered over a matching turtleneck jumper

And to add a casual touch to her ensemble, the Oscar-winning actress donned a pair of simple blue jeans and white trainers

While she completed the effortlessly stylish look by sweeping her blonde hair up into a messy updo and sporting bejewelled aviator glasses
She explained: ‘You don’t see something as fully realized as this, and as visceral and as enticing and powerful and memorable… To be in dialogue with this was just something I couldn’t turn down.’
Speaking about accomplished actresses Cate and Sienna coming on to executively produce Marion, Joe and Finn gushed: ‘It’s such a privilege to be on this journey with Sienna and Cate. We really feed off the passion they show for this story.
‘An important tale about a woman who shows courage and resilience in the face of adversity. We’re so excited to develop it further with this team.’
Sienna and Oli’s outing comes after the pair became parents last year, with the Anatomy of a Scandal star revealing her pregnancy for the first time in August 2023, when she displayed her blossoming bump while enjoying a day at the beach.
She later appeared on the cover of Vogue, displaying her bare bump alongside both Marlowe and Oli, as she spoke about her pregnancy for the first time and revealed she was expecting another girl.
During the rare interview, the Horizon: An American Saga star spoke candidly about how her pregnancy had been ‘unplanned’.
But she added that Marlowe had been wanting a sibling for some time and admitted she felt ‘more psychologically prepared’ than with her firstborn.
Sienna said: ‘I was very fortunate. I wasn’t necessarily trying to get pregnant. This happened as a total surprise and biologically was something I was able to do.’

Marion’s writer-directors Joe and Finn both posed alongside executive producers Cate and Sienna at the reception. The short film follows France ’s only female bull jumper in the tense 15 minute lead-up to her first performance in a packed arena

Sienna and Oli welcomed their first child together – a daughter – last December, while Sienna is also mother to 12-year-old daughter Marlowe, from her previous relationship with actor Tom Sturridge (Sienna, Oli and Marlowe pictured in May)
Discussing what is different this time around, she explained: ‘I have expectations where I had none before. I feel much more psychologically prepared than I was with Marlowe.’
‘It was quite a shock, the reality. I hadn’t given it the thought, I guess you can’t prepare for it. In my mind, I imagine it’s going to be the loveliest, but I think I’ve forgotten.’
Sienna went on to address the stigma around pregnancy as an older woman, confessing she’d been fighting her own prejudices around the subject.
She said: ‘I think people are comfortable with a way of living that has existed for many years, which is very misogynistic and patriarchal.’
‘Like me being the older woman in a partnership with a younger person or being pregnant over 40 and that that’s irresponsible and poor child and it’s such double standards.’
She added: ‘I’d love to get to a point where I didn’t feel the need to make a joke of my being older and having a baby, to show I’m in on the joke.’