Lady Gaga joined Tony Bennett on stage on Tuesday (July 1) at a Canadian jazz event.

The US star joined forces once again with the crooner at the Montreal Jazz Festival to run through some tracks.

They played the song 'Lush Life', as well as some new tune expected to feature on the pair's upcoming album.

Gaga said on Instagram as a caption to a photo: "Me and Tony singing some favorites from our new project.

"I had the time of my life tonight."

The 'Applause' star and Bennett have performed together on a number of occasions and they recently played at a special event for students in New York.

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Watch Gaga perform at the jazz festival below: