Wearing a bright yellow bikini and a transparent PVC rain mac, the singer gets hosed in spectacular style for Rolling Stone magazine.
The singer, wife of comic Russell Brand, strikes a sultry pose for the cameras as the water splashes against her amazing body.
Katy then takes control, holding the hose in her hand as she seductively slurps the water.
Another frame sees Katy wearing a silver Madonna-style cone bra and silver skirt.
The brunette looks out of this world as she spreads out across the floor.
A red rubber top and leather skirt made for another eye-catching outfit, while a luminous tight pink dress showed off her curves to perfection.
Katy's prized assets take prime position as she soaks up the sun while clinging to a railing.
In the magazine, Katy reveals her teenage battle with her breasts.
She says: "I started praying for my breasts when I was, like, 11, and God answered that prayer above and beyond, by, like, 100 times, until I was like: 'Please, stop, God. I can't see my feet anymore. Please stop!'
"So, what I did was, I started taping them down. How long did I tape them down for?
"Probably until I was about 19. And, no, I don't have any psychological pain because of it."
Katy says husband Russell has adapted well to his clean-living lifetsyle.
She added: "He's changed so much. If I have a hangover, I look at him and say: 'How the f*** did you do heroin every day, when I can't even have three glasses of wine and not want to ever drink again?'
"I'm so happy he lived, of course. God bless him."