Actor Keanu Reeves and Gordon Brown's wife Sarah have lent their support to an obscure Canadian rock group who are the subject of a new documentary.
Anvil! The Story of Anvil tells of a band formed in Toronto in the 1970s and who are still playing today.
"As a young man I remember Anvil posters everywhere in town," said Reeves, who grew up in Toronto.
Mrs Brown's brother Sean was involved making the movie, which had its UK premiere at the London Film Festival.
Anvil's lead singer, Steve "Lips" Kudlow, said the film's philosophy was to show it was "OK to dream and it's even better to live the dream".
"Really what it's all about is doing what makes you feel good about yourself."
The band were formed in Toronto by Kudlow and his schoolfriend Robb Reiner.
Their second album, Metal on Metal, gained them some success in 1982, and they supported acts such as Bon Jovi, but they later drifted into obscurity.
"We call ourselves lifers," Kudlow told BBC News.
"It wasn't an overnight thing and it was never planned to be.
"We wanted to do this for our lives - it was a decision that we made as young kids, that we're never going to give up."
Reeves, who signed autographs for screaming fans in London's Leicester Square, described the documentary as "a great story".
"It's a really inspiring film about friendship," he added.
Mrs Brown stood on the red carpet talking to those who were involved in the production, before going inside for the screening.