HE is not your average wedding singer but when you are asked to serenade Australia's richest man and his model bride at their star-studded $6m wedding, it's not an event you pass-up.

Canadian crooner Michael Buble has revealed he was the headline entertainment at James Packer and Erica Baxter's French Riviera wedding.

He was asked to perform at the event by his Australian promoter Paul Dainty, a friend of the newlyweds. "It's my second wedding ever," Buble said yesterday.

"The first time I did a wedding was for the Canadian Prime Minister's daughter (in 2000) and that's where I got my record deal."

Buble said he was given free rein over his musical choices.

"I met them (James and Erica) before, they were warm and lovely. I said 'Is there anything you want me to do?' and Mr Packer said 'Just have fun, that's it'. It was very Australian, very laidback," he said.

Buble took actor girlfriend Emily Blunt to the wedding. "I can't say enough how warm and low-key it was there. Just friends hanging out, Tom Cruise and Kate (Holmes) dancing."

While Elton John reportedly received $800,000 for singing at Packer's first wedding, Buble wouldn't comment on his fee. "It wasn't about money," he said.

The Daily Telegraph