Katy Perry is known for many things, including her extravagant, world-class live shows.

The pop superstar kicked off the'Witness: The Tour' -her fourth world tour in just eightyears - last night in Montreal, Canada after the first batch of shows were postponed due to production delays.

While we're sure many fans were upset that they have to wait a bit longer to see the 'Bon Appétit' star, she does'not'disappoint as the new show is a colourful, eye-popping spectacle with an incredible set list that'll make any Perry fan happy.

Emerging from the pupil of a huge eye that stretches across the entire stage, she opens the show with 'Witness' before quickly getting into the big hits like 'Dark Horse' and 'Chained to the Rhythm'.

The seond act of the show is a nostalgic affair as she performs five of thebiggest and best bangers from her first two albums back to back, including 'Teenage Dream', 'California Gurls' and 'I Kissed A Girl'. AMAZING.

Between the final four actsshe orbits into space for an acoustic guitar set, mixes 'Bon Appétit' with Janet Jackson's 'What Have You Done For Me Lately' (OBSESSED) and brings the 'Swish Swish' video to life with a giantbasketball court set-up.

Sadly, us UK fans need to wait until June to see'Witness: The Tour'but at least we know we're in for a real treat.

Check out the amazing pics below...

By Ross McNeilage

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'WATCH KATY PERRY, CALVIN HARRIS AND CO IN THE 'FEELS' VIDEO'