David Harbour’s ex-girlfriend sides with Lily Allen after scathing album reveals affair

Stranger things have happened.

Alison Sudol sided with Lily Allen after the singer dropped a scathing album about their mutual ex, David Harbour.

The actress, who dated Harbour in 2018, had a telling reaction to Allen’s Instagram upload promoting “West End Girl” last week.

When the Grammy nominee, 40, shared the album cover and song list on Oct. 20, Sudol commented, “🔥🔥🔥🔥🔥🔥🔥.”

Social media users praised the “Secrets of Dumbledore” star for chiming in.

“Alison has been there so she knows what Lily has been through,” one fan wrote, with another adding, “Love your support.”

Sudol’s rep did not immediately respond to Page Six’s request for comment.

Harbour moved on from Sudol with Allen in 2019, with the duo tying the knot the following year in Las Vegas.

Their breakup made headlines in February, and Allen filed for divorce last month — weeks ahead of releasing her record, which implies the “Stranger Things” star, 50, had an affair during their marriage without name-dropping him directly.

In scathing lyrics from “P–sy Palace,” Allen appears to accuse her estranged husband of having a “sex addiction.”

She sings in “Dallas Major” about a partner going “astray” from an “open” marriage, which she details in “Tennis.”

The alleged “arrangement” worked as follows: “Be discreet and don’t be blatant / There had to be payment / It had to be with strangers.”

Allen goes on to call out someone named Madeline for having not “just sex” but “emotion” with her partner later in the song.

Natalie Tippett was identified as the alleged other woman, confirming she has “of course” heard the new music in an interview with the Daily Mail over the weekend.

“I have a family and things to protect. I have a 2-and-a-half-year-old daughter, and I understand this is going on,” the costume designer, 34, said. “It’s a little bit scary for me.”

Harbour, for his part, has yet to address the viral songs.

The Emmy nominee was, however, photographed at Universal Epic Universe in Orlando, Fla., with Allen’s two children — Ethel, 13, and Marnie, 12 — on Saturday.

Allen welcomed the little ones with her ex-husband, Sam Cooper, while married between 2011 and 2018.