David Harbour's Alleged Mistress Calls BS On Lily Allen's 'False Narrative'

By Afouda Bamidele on December 15, 2025 at 3:15 PM EST

David Harbour and Lily Allen
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The mystery behind the end of David Harbour's marriage to Lily Allen continues, with his alleged mistress sharing a different narrative.

The MCU star became embroiled in a love triangle after his estranged wife released an album accusing him of ruining their relationship with his infidelity. However, the woman she seemingly dragged as the third party denies being a home wrecker.

David Harbour and Lily Allen made waves for their whirlwind relationship in 2019 and tied the knot a year later in Las Vegas. Although they did not welcome any children, the "Smile" singer has two children from her first marriage to Sam Cooper.

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David Harbour's Alleged Mistress Calls Out His Estranged Wife For Spreading Lies

The woman many believed was responsible for ruining Harbour and Allen's marriage has finally broken her silence. Natalie Tippett addressed the viral situation on her Instagram Stories, stressing that she could no longer stay silent.

"I was hoping to not speak on this, but I am tired of this false narrative being pushed and circulated. This was such a marginal part of my life, but it's now turned into a major disruption," Tippett began. She denied ever speaking about the situation in an interview or being paid to address the matter.

Tippett claimed she had ring camera footage to prove her innocence, noting that she misquoted when she said she was "fearful of a strange man" at her door.

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She did confirm that she was harassed at her home with her daughter on October 25 at 8 am by someone who claimed they would run an article on her regardless of her opinions.

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The Third Party Seemingly Blames Lily Allen For Attempting To Ruin Her Reputation

Lily Allen at the 2025 Planned Parenthood New York Gala
ZUMAPRESS.com / MEGA

Although Tippett did not mention Allen by name, it was clear that her words were directed at the singer. She alleged the man who visited her home claimed she had been outed by "this person and her team;" however, the statements Allen shared were false.

"I did not have a three-year affair with anyone. I'm unsure why this person wants so badly to pit people against me or create this narrative that we both know is false," Tippett lamented. She argued that the text messages Allen referenced in her new album contradicted the truth.

Tippett noted that the messages were used in a song without her consent, making her feel "extremely violated" with a target on her back. She claimed she had been getting messages telling her to die and other "obscene things" she chose not to share on the platform.

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The Actor's Alleged Flame Drops A Bombshell About His Marriage

David Harbour at the 30th Annual Critics' Choice Awards
Xavier Collin/Image Press Agency / MEGA

Tippett kept wondering why Allen was targeting her as the reason her marriage to Harbour failed, instead of facing her husband, who started the situation. She then dropped a bombshell about the duo's union, claiming they had been in "an open relationship."

The alleged mistress doubled down on having no bad blood with Allen and wished her "all the success, money, healing, and happiness, and whatever else she's seeking through this." In her third and final post, Tippett reminded the public that she was a living being and not what Allen painted her to be.

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As a single mom, Tippett argued that she wouldn't risk her happiness for anything in the world, nor could she resonate with someone who profited off "painful lies." She added that she had shared her truth and hoped people would stop asking her to die or criticizing her without understanding the whole story.

The 'Thunderbolts' Star's Ex-Girlfriend Supported His Estranged Wife

Lily Allen at Serpentine Summer Party 2025 In London, UK - 24 Jun 2025
ZUMAPRESS.com / MEGA

Tippett's decision to break her silence follows Alison Sudol's decision to support Allen following the release of her scathing album. The Blast covered the story in October, reporting that Harbour's ex-girlfriend had showcased her love for his estranged wife on Instagram.

"The Fantastic Beasts" actress seemingly stood in solidarity with Allen by commenting on the promotional post for the singer's new album, "West End Girl." Sudol dropped a string of fire emojis, a move that caught fans' attention as a women-supporting-women moment.

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The timing added to the speculations as Allen just filed for divorce and dropped tracks that hinted at Harbour's infidelity, addiction, and a marriage that slowly ended behind the scenes. Sudol and Harbour dated in 2018, with the actor moving on with Allen after their 2019 breakup.

David Harbour Feels Conflicted About Changing His Past Mistakes

David Harbour at Violent Night Los Angeles Premiere
OConnor/AFF-USA.com / MEGA

Despite the infidelity allegations and his separation from Allen, Harbour wouldn't jump headfirst at a chance to change his past. The Blast shared in November that he was asked if he would change anything about the past 50 years, but couldn't give a straight answer.

Harbour explained that he felt conflicted about changing the past because regret was a complicated subject. He argued that "the pain and the slip-ups and the mistakes" were significant in shaping him into the person he is today.

On that note, Harbour believed that trying to rewrite any moment in his past would mean rewriting his entire journey. He did not seem keen on following that route because it would erase the lessons and growth that came with the challenges he faced and the mistakes he made.

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Will Lily Allen respond to David Harbour's alleged mistress's claims?

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