Canadian crooner Michael was performing in Newcastle on the weekend and invited stunned Jimmy Smart up to sing a rendition of 'Let It Snow' with him.
Jimmy is famed for his voice in his hometown of Dundee and his punters even call him 'Jimmy Bublé'! When Michael's team got wind of this, they offered Jimmy free tickets to the front row of his gig.
But if that wasn't enough, Michael then called out to Jimmy in the audience and hauled him up on stage!
Jimmy, 53, told The Sun: "I couldn't believe it was happening. It was the biggest thrill of my life. I will never forget that night!"
Michael Is back in the UK for his 'MB World Tour', which has seen him travel the world for more than a year. Wow!
On Sunday night, he surprised X Factor fans after appearing from behind a screen to sing a duet of 'Baby It's Cold Outside' with Frozen star Idina Menzel.
The pair appeared to be having a great time duetting together, however Cheryl Fernandez-Versini and Mel B came under fire for refusing to give Michael and Idina a standing ovation - while Simon Cowell and Louis Walsh did.
Michael and Idina have had the last laugh though, as they are heading for a No1 with their cover in the Billboard Adult Contemporary chart in the US!
Watch 'Jimmy Bublé' performing here: