David Harbour's alleged mistress is costume designer Natalie Tippett, according to new claims.

RadarOnline.com can reveal the single mom, 34, met the Stranger Things star, 50, while filming a movie in New Orleans in 2021. Article continues below advertisement

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His estranged wife Lily Allen , 40, documented their "affair" in her new revenge song Madeline , from newly released album, West End Girl.

In the track, Allen sang about Harbour breaking the rules in their "open" marriage.

Reacting to the song, Tippett said: "Of course I've heard the song.

"But I have a family and things to protect. I have a two-and-a-half-year-old daughter, and I understand this is going

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