The two pop stars are both experiencing chart success with their respective singles 'Blow' and 'Till the World Ends' and Kesha is keen for them to celebrate in a unique way by going swimming without their clothes on, followed by a Wild Party.
She said: "We could go skinny dipping.
"We could have a party and it would be a dress-up-like-Kesha-or-Britney party. Either her place or my place, it doesn't matter."
But it seems Kesha's home would be the ideal place to have the party as she recently installed an underwater stereo at her Nashville pad.
She told People magazine: "I have a small, salt-water pool that has laser beams in it and a stereo so you can be under water listening to music. It's really magical."
As well as wanting to strip off to go under water, Kesha recently revealed she uses her naked body to create art.
The 'Tik Tok' singer has taken up painting in order to relax while on tour and she has now taken a new approach by using herself in her work.
The 24-year-old star said: "I have recently taken up painting as a way of killing time on tour.
"I got a big canvas, threw some paints down and then stripped off and rolled around on it.
"It's very liberating. And very, very messy."