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His love songs have inspired millions, but over the weekend Sir Paul McCartney had a more direct role in the love story of one Canadian couple.

The former Beatle was in Winnipeg, Manitoba, for a concert when he photo-bombed a couple taking pictures before their wedding.

McCartney passed the couple while riding his bike along the river during his downtime on Saturday.

The moment was immortalised by the couple's wedding photographer.

Groom Steve Gregg was the first to spot the famous musician.

"He said congratulations as he rode by and Steve said, 'That was Paul McCartney,'"

But when McCartney and his two bodyguards hit a dead end, they had to turn around and ride past the couple again.

That's when Mr Gregg plucked up the courage to ask for a picture.

"It was very brief, he shook our hands, said congratulations took a couple quick photos and then they were off,"

The couple said they are fans but hardly Beatle-maniacs, and have kept a healthy perspective on their brush with mega-stardom.

"This is was a nice thing on a day filled with wonderful events," Mr Gregg said.

"But certainly not the best thing that happened to me yesterday."