Katy Perry Rocks an Itty-Bitty Bikini

Nothing like a worldwide tour to keep your bangin' bod in shape.

Katy Perry took to Instagram on Monday to share a cute photo of herself in which she's sporting an itty-bitty black bikini while basking in the sun during a day off from her busy concert schedule. 

"Thank you @schlitterbahn KC for hosting the kids on #theprismaticworldtour today! We can't wait to do our costume changes with our sunburns tomorrow!" the 29-year-old pop star captioned the adorable shot.

During the "Fireworks" singer's fun-filled day, she spent time hanging with her Prismatic pals in the pool, where the group filmed a silly underwater video, which (coincidentally?) provides an extreme close-up of Perry's enviable figure.