Poppy Delevingne, sister of Cara Delevingne, and former flame of Prince Constantine-Alexios, is now romantically linked to Archie Keswick, Sienna Miller’s ex-boyfriend and heir to a £6 billion fortune, dubbed as ‘the most eligible bachelor you’ve never heard of’.

Top model and actress Cara Delevingne is said to have amassed a fortune of more than £100million. Her sister, Poppy, is, however, now going out with the scion of a multi-billion-pound empire.

I can disclose that actress and model Poppy, 38, is enjoying a passionate romance with Archie Keswick, 42, an ex-boyfriend of Hollywood star Sienna Miller.

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 Hotel Group. His family fortune is reputed to be more than £6billion.

Actress and model Poppy (pictured), 38, is enjoying a passionate romance with Archie Keswick, 42, an ex-boyfriend of Hollywood star Sienna Miller

Archie Keswick and Sienna Miller attend the Polo Ralph Lauren and British Vogue day during Wimbeldon 2021

One of Poppy Delevigne’s pals has disclosed that her new relationship with Archie is ‘serious’

‘It’s a serious relationship,’ one of her pals tells me.

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.

Poppy separated from her husband, James Cook, 41, who works for his family’s aerospace company, in 2022 after eight years of marriage.

Eton-educated Keswick has two daughters with his ex-wife, Alice, an interior designer and former model.

At the end of April, Poppy and Sienna both attended the 25th birthday party of their aristocrat pal Lady Lola Bute 

The daughter of the late John Crichton-Stuart, 7th Marquess of Bute and fashion designer Serena Bute, hosted guests at her family seat Mount Stuart House on the Isle of Bute in the Scottish Highlands.

Once there, well-heeled guests had a weekend-long celebration, dancing in the 19th Century Gothic revival dining hall, and sleeping in grand bedrooms that look straight out of a fantasy novel.