The song, called "Who You Love," will be featured on John's upcoming sixth studio album Paradise Valley, which drops later this month.
According to "Us Weekly," the pop singer joked about what she called the "love giggle" she lets out towards the end of the recording. She likened it to Mariah Carey's 90s love songs.
But on a serious note, she said she was "just so happy" singing with her beau.
John has also spoken publicly about his feelings for Katy, thanking her for helping him through his vocal issues when he returned back to the stage earlier this year.
"Who You Love" marks their first professional collaboration together. Check it out below:
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