The 'Fireworks' singer, 28, wore head-to-toe black and white and topped off the adorable outfit with a pretty bow in her hair.
In a cosy-looking fluffy white jumper, monochrome checked skirt and matching jacket, Katy headed to London's famous Nobu for a night out (Sept 27).
Not one to forget her accessories, Katy teamed the look with over-the-knee black socks, smart black and white shoes, and black rucksack - she could almost have been going to school!
Earlier this week, Katy received her second waxwork at Madame Tussauds in New York.
The accolade topped off an amazing few weeks for the singer, after her single 'Roar' became number one in the UK singles chart for two weeks running.
Do you like Katy's black and white look? Tell us what you think below!
Watch the video for Katy Perry's single 'Roar':