Lily Allen attacks estranged husband David Harbour on Halloween

Lily Allen, as fans say, is committed to not letting her estranged husband David Harbour have a moment of peace after he allegedly cheated on her.

Dedicated to her bit, the 40-year-old singer took to TikTok to reveal her thoughtful Halloween costume, which seemed to poke fun at the Stranger Things star’s affair with someone Allen mentions as “Madeline” on her album.

The Tennis hitmaker fittingly dressed up as Madeline for the occasion, the famous character from the children’s book series, and the woman mentioned on West End Girl.

“Who IS Madeline though, actually?” Allen wrote in the caption, quoting her own lyrics, from the song, Tennis.

The Smile songstress showed off her look with Cardi B’s Magnet playing in the background of her video.

Social media users quickly flocked to share their appreciation for the look, with one writing, “PERFECT NO NOTES,” wrote one user.

“The crashout is so valid,” another added, while one quipped, “you had the opportunity to do the funniest thing and you did.”

Others chimed in, writing, “Iconic,” and “David harbour welcome to your tape.”

The fresh dig at Harbour comes after Allen released a deeply personal and explosive album, in which she dissects their four-year-long marriage, which ended after he allegedly betrayed the singer.