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.
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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.
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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!