A-list actor’s divorce from singer threatens to get extremely ugly

But sources say Harbor was blindsided by the release.

A Hollywood insider said: “David knew Lily was writing about their breakup, but he didn’t expect it to be so personal – or that people would think every word was directed at him. He has been furious ever since and is now warning friends that if she continues to push, he will share things that could seriously damage her image.”

Allen and Harbor split last year after she accused the actor of having multiple affairs, including a three-year relationship with Tippett.

Despite the bitter tone of the singer’s new record, Harbor was recently spotted with Allen’s daughters from her previous marriage — Ethel, 13, and Marnie, 12 — at a theme park in Orlando, Florida, suggesting there may be a fragile truce behind the scenes.

But the tension between them is palpable.

Another source said: “They’re doing their best to remain civil for the sake of the children, but tensions are running high. David’s friends say he’s done keeping quiet – and if he decides to say anything, it could completely destroy the image Lily is painting with this record.”

West End girl has already topped the UK iTunes charts and has been streamed over eight million times on Spotify.

But those close to Allen say that now that Harbor is “ready to speak his truth,” the real drama of Hollywood’s latest, nastiest divorce may still be yet to come.