They used to be best friends attending glamorous events and partying together and even living with each other in New York.

However it seems Sienna Miller and Poppy Delevingne are no longer pals after the model seemingly broke girl code and began dating the actress’ ex. 

Poppy, 38, is preparing to welcome her first child with her boyfriend Archie Keswick who previously dated Sienna, 43, back in 2021. 

While it is unknown when or on what terms the couple parted ways, it seems to have left a frosty rift between Sienna and Poppy. 

Last week Poppy enjoyed a very posh baby shower ahead of the arrival of her baby girl. 

The celebration boasted an impressive array of celebrity guests including Poppy’s sister Cara, Alexa Chung, Jaime Winstone and Keith Richards’ model daughter Ella Richards.

Inside Sienna Miller and Poppy Delevingne’s feud as the model prepares to welcome her first child with the actress’ ex Archie Keswick following her baby shower no show last week

Poppy and Archie were confirmed to be dating last May after a pal told the Daily Mail’s Richard Eden: ‘It’s a serious relationship’ (pictured L in July 2024) 

However, despite being spotted out in London just hours prior on a night out with her boyfriend Oli Green, 28, for PR guru Fran Cutler’s birthday, Sienna was nowhere to be seen. 

The pair used to be firm friends with Poppy previously admitting she was like her ‘heroine’ and she ‘wanted to be just like her’. 

Speaking to Vogue about how much she admired the actress before they had even met she gushed: ‘I remember when Sienna Miller’s first cover came out, just after she was in and before I knew her. 

‘She looked so dreamy in white and she had feathers in her hair and that whole boho thing going on.’

Poppy added: ‘She was totally my heroine at the time, I just wanted to emulate her. And now of course we’re friends and I’m always telling her how I wanted to be just like her – she probably finds it quite scary.’

Yet while the pair used to be pictured at multiple events together, it appears things between them have cooled off.

They last attended the 25th birthday party of their aristocrat pal Lady Lola Bute in April 2024. 

Meanwhile Sienna is known to be pals with the other guests who made the list for Poppy’s baby shower, including Alexa who is engaged to Sienna’s ex Tom Sturridge. 

The pair used to be firm friends with Poppy even previously admitting she was like her ‘heroine’ and she ‘wanted to be just like her’ (pictured in 2013)

Despite being spotted out in London just hours prior to the baby shower on a night out with her boyfriend Oli Green, Sienna didn’t attend the celebrations (pictured in 2021 with Archie) 

Yet while the pair used to be pictured at multiple events together, it appears things between them have cooled off (pictured with Gala Gordon and Sofia Boutella in 2022)

Tom and Sienna share daughter Marlowe, 12, and dated for for four years prior to their split in 2015.  

However the pair are still on good terms, with Sienna calling Tom her ‘best friend’ and she and Oli even joining her ex and Alexa on double dates. 

Sienna has given her seal of approval for her ex and Alexa and in December told Vogue UK: ‘I’m really happy for them. It’s genuinely lovely.’ 

Sienna was also known to be close pals with Cara with the pair attending many fashion weeks and glamorous events together over the years, also with Poppy too. 

More recently Sienna made sure to attend Cara’s debut performance in Cabaret after she graced the West End stage in March 2024. However more recently they haven’t been pictured together. 

Poppy and Archie were confirmed to be dating last May after a pal told the Daily Mail’s Richard Eden: ‘It’s a serious relationship’.

The couple later went public with their romance in July 2024 when they attended the BST Hyde Park festival together. 

Archie, who has been described as ‘the most eligible bachelor you’ve never heard of’, is a member of the Jardine Matheson dynasty which owns the Mandarin Oriental H๏τel Group. His family fortune is reputed to be more than £6billion. 

Sienna is known to be pals with the other guests who made the list for Poppy’s baby shower, including Alexa who is engaged to Sienna’s ex Tom Sturridge (pictured together in February) 

Tom and Sienna share daughter Marlowe, 12, and dated for for four years prior to their split in 2015 (pictured) 

Sienna was also known to be close pals with Cara with the pair attending many fashion weeks and glamorous events together (pictured at Wimbledon in 2023) 

The Keswicks have controlled Jardine Matheson for five generations and the group’s interests range from prime Hong Kong real estate and brands, including the Mandarin Oriental H๏τel, to Vietnam’s largest dairy producer.

Archie is also the son of Simon and Emma Chetwode, daughter of Major George David Chetwode and Lady Willa Elliot-Murray-Kynynmoun.

He also has one brother Ben, who is the chairman of Jardine Matheson, and two sisters Willa and Poppy.  

Like his father, Archie was educated at Eton before going on to receive an undergraduate degree from Edinburgh University.

Despite being from a billionaire family, Archie and his siblings were made to understand the value of hard work growing up.

‘He is the most incredible person in the world but he’s just not the kind to give out money at all,’ Willa said of her father in a 2011 interview with the Evening Standard to promote the opening of her Notting Hill shop, The Village Bicycle. 

‘Growing up, my siblings and I all had summer jobs and worked in pubs. He brought us up to graft and to get where he is now he grafted too.’ 

Poppy previously said of Sienna: ‘She was totally my heroine at the time, I just wanted to emulate her. And now of course we’re friends and I’m always telling her how I wanted to be just like her – she probably finds it quite scary’ (pictured together at Glastonbury in 2013) 

Archie is a member of the Jardine Matheson dynasty and his family fortune is reputed to be more than £6billion (pictured with his ex-girlfriend Hannah Sandling in 2003)

Archie is also the son of Simon (pictured) and Emma Chetwode, daughter of Major George David Chetwode and Lady Willa Elliot-Murray-Kynynmoun 

Read More Inside Poppy Delevingne’s lavish baby shower with A-list guests and a royal flourish

Archie previously dated TV personality Hannah Sadling before meeting his future wife Alice Rugge-Price in 2010. 

The couple tied the knot in 2011 before going on to welcome two daughters together. 

It is thought the pair split in 2019 – the year he appeared on Tatler’s ‘most eligible’ list – with Alice revealing in an October 2020 interview that she was living with her two daughters in an apartment in an exclusive part of Hong Kong. 

It was then he began dating Sienna after the pair were spotted out and about on a number of dates together after being friends since the 2000s. 

Meanwhile Poppy split up with her ‘toyboy’, Prince Constantine Alexios of Greece and Denmark, 25, last December. The Greek royal, affectionately known as Tino, is Prince William’s godson.

The star separated from her husband, James Cook, 44, who works for his family’s aerospace company, in 2022 after eight years of marriage.

Poppy discovered she was pregnant at London Fashion Week last autumn. She noticed during her second fitting for a Burberry show that her outfit felt тιԍнтer than the first session, two weeks before. She took a test straight away.

‘She really is all I’ve ever wanted,’ she told ELLE in January. 

‘Obviously, I would have been fine with either and when I was younger I always thought when I get pregnant, I wouldn’t find out, but the second we got told we could find out, we did. 

‘I’m so excited. I come from all girls, we’re very girl heavy. Girls are great.’

She said her sisters were ‘elated’ when they found out the news, adding: ‘It just feels like such an extraordinary privilege to be able to do this, to be able to have a baby at this age and at this time, and when it happened, I couldn’t really believe it. It still feels really surreal.’

The star said: ‘We were all in New York, with each other and with the bump and there was a lot of talking to the bump, stroking the bump. They’re just elated.’

Sienna and Poppy pictured with Cara (L) and Jazzy De Lisser (middle R) at charity bash in May 2022

Poppy discovered she was pregnant at London Fashion Week last autumn. On finding out the news she said: ‘It’s all I’ve ever wanted’ (pictured in April) 

Poppy and Archie kept the news of her pregnancy to themselves for a while and only told friends and family around the four-month mark.

The model admitted she was ‘really nervous’ about her pregnancy and wanted to ‘protect’ it for a while.

She explained: ‘It just feels like such an extraordinary privilege to be able to do this, to be able to have a baby at this age and at this time, and when it happened, I couldn’t really believe it.’

Poppy has long wanted to start a family of her own but admitted in recent years she thought it might not happen for her and had ‘made peace with it’.