Kim Kardashian's nine-year-old daughter North West was brought on stage by Katy Perry during the popstar's Las Vegas residency PLAY at Resorts World on Saturday night.
An eyewitness told DailyMail.com that Katy, 38, hosted a 'walk-off competition' for her Firework Foundation and 'invited North West onto the stage' to participate.
"While on the stage North asked if her friends could join her and Katy obliged," they revealed.
Kim Kardashian decided to treat her daughter, North West, to a Katy Perry concert in Vegas Saturday night, and the kid got way more than she bargained for!
Katy invited North and some of her friends up on stage to dance smack in the middle of the concert. The crowd went nuts, as Kim was taken up to the front row so she could watch her daughter perform.
There were others roaring their approval, including Paris Hilton and Sia. And get this ... Paris's hubby, Carter Reum, had earplugs in as he danced to the music.
Katy bestowed the crown on North and another kid as the walk-off winners. No surprise there ... actually, the crown was a pizza, but still ...
Fun night had by all, especially NW.