A star of the new Fisherman's Friends movie was caught on camera staging an impromptu singalong with locals on a Cornish beach.
The sequel to the hit movie - a true story about a sea shanty group that finds unexpected fame - is currently being filmed around Port Isaac.
And when holidaymaker Andrew Laurence, 65, strolled past the quay on Friday night he was drawn to a stunning female singing voice.
As he got closer he released it was Imelda May, an Irish singer song writer, who is starring in the follow-up film featuring the band revelling in their new found success.
It is Imelda's first movie role after a successful singing career but she took centre stage in leading the gathering hoards in a belly-busting rendition of Hit the Road Jack.
Andrew, 65, of Enfield, a freelance news cameraman filmed the scenes on his mobile.
He said: "My wife and I were walking along the quay and heard some singing. There were several guys there who I thought might have been part of the original Fisherman's Friends.
"I knew they were making a new film about them that is being shot in Port Issac at the moment, but the only one I recognised was Imelda May.
"I know it's one of her first ventures into acting and they were just having a singalong by the seaside. I initially just heard a female voice singing Hit the Road Jack rather well, which turned out to be her standing there with a glass of prosecco. The others all then joined it.
"It was a really nice scene and they then all started singing a Cornish fishing song.
"Imelda certainly knew what she was doing. I know she's talked about how excited she is to be in Cornwall. There may have been other film crew and cast members and they could have been enjoying a bit of downtime after filming."
The first film told the true story of a group of Cornish fishermen who formed a sea shanty group and achieved unexpected global fame.
The follow up is expected to follow their journey as unlikely celebrities - including a performance on the Pyramid stage at Glastonbury.
Tweeting previously about her new role, May, who has just released her new album Diamonds, said, "So the big secret is . . . I'm making my acting debut in as Aubrey Flynn. I'll join the original cast to tell a beautiful story on the shores of enchanting Cornwall. It's a bit of a dream of mine to be honest.
"So far, it's truly been an absolute honour to work alongside Meg Leonard, Nick Moorcroft, James Spring, and my other castmates. Adventure calls and so I follow."