Poppy Delevingne is dating Sienna Miller's ex

Archie is a member of the Jardine Matheson dynasty which owns the Mandarin Oriental Hotel Group.

A source told the Daily Mail's Eden Confidential column: "It's a serious relationship."

Archie - who was linked to Sienna in 2021 - has two daughters with his ex-wife, Alice, an interior designer and former model.

Meanwhile, Poppy split from her husband, James Cook, 41, in 2022 after eight years of marriage, although the pair have never publicly addressed the break-up.

Last year, Poppy dated Prince Constantine Alexios of Greece and Denmark, although the pair ended their romance in December.

Speaking about the breakdown of her relationship with the royal, who is 12 years her junior, a source told the Daily Mail: "They are just at different stages of their life. There is no animosity."

Poppy and businessman James enjoyed two wedding ceremonies with one taking place in London and the other in Marrakesh, Morocco.

And, despite the split, Poppy previously revealed she would save her two wedding gowns from a fire above any other possession she has, even though one dress is now on display in a museum in Norway.

Speaking on This Old Thing? podcast, she said: "I had one [dress] designed by the wondrous Karl Lagerfeld, for Chanel.

"For part two, I wore a Peter Dundas for Pucci wedding dress. That's now in a museum in Norway - he's stolen it back from me. I want it back because I want to do the washing up in it.

"[I'd save] those two things if my house is burning down - they hold so much sentimental value."