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,

The couple’s extensively renovated Brooklyn townhouse includes a windowless pink primary suite that Allen called a ‘bed womb.’

David Harbour has seemingly confirmedhis split from Lily Allen with a solo appearance at the Critics Choice Awards.

For several years, the pair appeared to be the picture of wedded bliss, settling down with Allen's two children, Ethel and Marnie, in a Brooklyn townhouse that the duo completely transformed into a "weird and wonderful" paradise filled with eccentric decor.

Unfortunately for fans of the couple, it seems to be all over for David Harbour and Lily Allen, who is "devastated" by the split.

David Harbour stepped out for the first time since his split from Lily Harbour at the Critics Choice Awards. A source exclusively confirmed to PEOPLE on Feb. 3 that Harbour and Allen were parting ways after four years of marriage.

David Harbour attends the 2025 Critics Choice Awards without his wedding ring after his split from Lily Allen.

In recent months, rumours have swirled online suggesting the Smile singer and Stranger Things actor were having marital problems. And in a report published by People on Monday, sources claimed Allen and Harbour have separated after four years of marriage.

Stranger Things star David Harbour attended the Critics Choice Awards 2025 in Santa Monica Feb. 7, marking his first appearance since his reported breakup with wife Lily Allen.