Lily Allen gave rare insight into her and David Harbour’s breakup timeline in her latest interview.

The singer appeared on “CBS Mornings” Thursday to discuss her scathing “West End Girl” album , inspired by her marriage to the 50-year-old “Stranger Things” star.

The Grammy nominee, 40, hinted that she split from Harbour prior to last Christmas because she finished recording the album before the holidays.

When Allen was asked how she felt about wrapping up the project, she noted, “My life was falling apart, so I had to go deal with real practical stuff. It was Christmas. I’ve got two kids.

“I realized I needed to go do some work on myself, and I checked myself into a place to go and get the help I needed,” she continued.

“I’ve been institutionalized before but not of my own volit

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