David Harbour has been seen for the first time since it emerged he had a three-year affair during his marriage to Lily Allen.

The Stranger Things star, 49, attended CinemaCon 2025 at The Colosseum at Caesars Palace in Las Vegas on Thursday.

The actor posed with Florence Pugh at the event where Disney was presenting its upcoming release schedule.

David was dressed casually for the event in a black shirt and matching T-shirt along with a pair of dark grey trousers.

It was the actor’s first outing since it emerged he had a relationship with a younger colleague during his marriage to singer Lily.

The Daily Mail was told the American actor was romantically involved with a younger costume designer, whom the Mail has chosen not to name.

David Harbour has been seen for the first time since it emerged he had a three-year affair during his marriage to Lily Allen 

Lily, who has two daughters with first husband Sam Cooper, wed David in Las Vegas in 2020 a year after they met on Raya (pictured in 2020)

‘David cheated on Lily,’ an ᴀssociate said. ‘They met on a movie they did together.’ The source, who witnessed their interactions on set, said: ‘They weren’t very secretive about their relationship.’

So serious did the romance become that David paid for the woman to travel more than 400 miles to visit him while he was working on his hit Netflix TV series last year.

‘David flew her to Atlanta while he sH๏τ Stranger Things to keep him company,’ the ᴀssociate said.

Lily, who has two daughters with first husband Sam Cooper, wed David in Las Vegas in 2020 a year after they met on Raya.

The couple moved from London to New York, where she enrolled her children in school.

Daivd bought a house in Atlanta, Georgia, last year to be closer to the Stranger Things set.

The couple separated late last year after the singer, whose songs include the hit Smile, speculated that David was using Raya.

The Mail on Sunday reported that she turned detective by joining the app herself, pretending to be ‘looking for women’, and allegedly found that he had set up a new dating profile.

The actor posed with Florence Pugh at the event where Disney was presenting its upcoming release schedule

David was dressed casually for the event in a black shirt and matching T-shirt along with a pair of dark grey trousers

The couple separated late last year after the singer, whose songs include the hit Smile, speculated that David was using Raya (pictured in 2022)

Raya has more than 10,000 members and accepts only eight per cent of applicants. There are 100,000 on its waiting list.

Lily’s London friends said she had suspected that her husband was interested in other women. 

A source previously revealed: ‘Lily is of the belief that he has been open to meeting new people for some time now, though she only found out at the end of the summer. He has been living in Atlanta for a year for filming.’ 

In January, Lily took a break from Miss Me?, the podcast she presents with her friend Miquita Oliver, after she admitted she was ‘really not in a good place’.

She recently returned to the podcast, on which she criticised Harbour and mocked his abilities in the bedroom.

David’s former lover declined to comment, while his spokesman said: ‘We don’t comment on private matters.’