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 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.

Lily Allen says that she's "in a stronger place" after leaving a multi-week treatment program. "I just feel very grateful to have been given the time and the space that I needed." Allen, 39, said on the Thursday,