Lily Allen and David Harbour are separating four years after they married in September 2024, multiple sources confirm to PEOPLE. "Her marriage has been crumbling," an insider tells PEOPLE exclusively,

TheStewartofNY/WireImage David Harbour was spotted out-and-about with a woman amid rumors that he and wife Lily Allen split. Deux Moi shared several photos of Harbour, 49, and model Ellie Beers Fallon via their Instagram on Saturday,

The British recording artist and her American actor husband David Harbour – whom she married in 2020 – have reportedly split. She said during the podcast that she went into treatment in part because of her daughters Marnie, 12, and Ethel 13, whom she shares with ex-husband Sam Cooper.

David Harbour made his recent red carpet appearance sans a wedding ring amid rumors he and wife Lily Allen have split. Harbour, 49, attended SNL's 50th anniversary special solo, despite having been spotted with a 27-year-old model earlier in the week.

David Harbour has reportedly begun dating 27-year-old model Ellie Fallon, just two months after his split from singer Lily Allen. The Stranger Things actor, 49, is seeing the aspiring actress and model who is 22 years his junior,

Lily Allen and David Harbour married in 2020 following a whirlwind romance, but have now split up – and David is said to have moved on with an aspiring model and actress