Katy Perry Brings Surprise Guest North West on Stage in Vegas as Kim Kardashian Watches On!

Katy Perry brought out a surprise guest to join her on stage during her Las Vegas Residency over the weekend – North West! Kim Kardashian flew North, her niece Penelope Disick, and a handful of their pals to Katy‘s concert over the weekend, where they all got the chance to dance with Katy on stage.