David Harbour Returns to UK for Thunderbolts Premiere, Shows Off Thick Hair and Smile Amid Transplant Rumors After Lily Allen Split

*David Harbour Makes First UK Appearance Post-Split at Thunderbolts Premiere*
(Include image: David Harbour at the London premiere, smiling in a black suit with a printed shirt. Caption: David Harbour at the Thunderbolts premiere in London.)

David Harbour, 50, returned to the UK for the first time since his split from Lily Allen, 39, attending the star-studded London premiere of *Thunderbolts* on Tuesday. The Stranger Things* actor turned heads with his animated red-carpet presence and noticeably thicker hair, fueling ongoing rumors of a mid-life crisis-driven hair transplant.

(Include image: Harbour and Allen in December 2023. Caption: David and Lily during happier times in December 2023.)

The event marked Harbour’s first public outing in the UK since the Mail revealed his three-year affair with a younger costume designer during his marriage to Allen. Sources claim the pair met on a film set and were “not secretive” about their relationship, with Harbour allegedly arranging travel for her to visit him during Stranger Things shoots in Atlanta.

Fans quickly linked his revamped hairstyle to the scandal, flooding social media with jokes. One tweeted, “David Harbour really got a hair transplant at 49, cheated on his wife… middle age crisis let’s goooo,” while another quipped, “The Turkish hair transplant industry should hire him.”

(Include image: Side-by-side of Harbour’s hair in 2023 vs. 2025. Caption: Fans speculated about a hair transplant after comparing his look pre- and post-split.)

Meanwhile, Allen, who met Harbour on the exclusive dating app Raya in 2019, was reportedly devastated after discovering he’d secretly rejoined the platform. A source revealed she created a fake profile to investigate, leading to their late-2023 split. Post-divorce, Allen underwent a breast augmentation, sharing the results in a swimsuit selfie.

(Include image: Lily Allen’s swimsuit selfie. Caption: Lily showcased her post-split transformation in a recent selfie.)

At the premiere, Harbour charmed fans, signing autographs and posing for selfies while sporting a tailored black suit and printed shirt. He later joined co-stars Florence Pugh and Sebastian Stan at an afterparty.

(Include image: Harbour with Florence Pugh on the red carpet. Caption: David cosied up to onscreen daughter Florence Pugh at the event.)

The actor’s representatives have not commented on the affair or hair transplant rumors. Harbour and Allen married in Las Vegas in 2020 but had been living separately for months prior to their split, with Harbour purchasing a home near his Stranger Things filming location.

As the fallout continues, Harbour’s return to the spotlight highlights both his professional momentum and personal controversies, leaving fans speculating about his next move.

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