This is how Katy Perry parties when she's single.
Surrounded by four shirtless men, the "Dark Horse" singer hit the water in a teeny, and we mean teeny, black bikini.
The video shows the gang going underwater at Kansas City's Schlitterbahn Waterpark as they throw up peace signs, and one of the gentleman's YOLO sunglasses floats off his face.
The 29-year-old captioned the summer video: "Hi from the #theprismaticworldtour."
Perry later posted another pic on Monday, thanking the waterpark. She wrote: "Thank you @schlitterbahn KC for hosting the kids on #theprismaticworldtour today! We can't wait to do our costume changes with our sunburns tomorrow!"
One thing's for sure, this "California Gurl" knows how to do summer right!