John Farnham joined Celine Dion on stage for surprise duet of 'You're The Voice' - and it is INCREDIBLE!

Celine Dion fans in Melbourne got the surprise of their life when none other than Aussie rocker John Farnham appeared on stage for an extra special performance.

During the final night of her Australian tour the pair performed a powerhouse live version 'You're The Voice' - which Celine had been performing solo each night.

But that's not all.

Celine also roped in a few bagpipers to perform!

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Following the performance, Celine took to Twitter to thank John for the performance, saying: "I still can’t believe that I got to perform You’re the Voice with @johnfarnham! John, thank you for your incredible talent. I love you! Thank you, Melbourne - Céline xx"

What a performance!

But now the BIG question is - what song will us Kiwi fans get?