The 'Sleazy 2.0' singer, who co-wrote Spears's 'Till the World Ends', confessed that she is still excited about having her fellow popstar lay vocals onto her tracks.
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"That song just came on the radio and I have to say, I love hearing Britney Spears sing my lyrics, every single day," Ke$ha explained to MTV News.
"It never gets old. I get so excited. It's better than any drug when you hear Britney Spears sing a song you wrote."
As for her own career, Ke$ha went on to say that she still has a lot to prove as an artist, adding: "I have a lot of growing and evolving to do.
"I'm definitely not a one-trick pony and I think more people are starting to see that more and more."
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Watch the video to Britney Spears's 'Till the World Ends' below: