Katy Perry and John Mayer’s Duet ‘Who You Love’

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"Who You Love" is the name of Katy Perry's duet with beau John Mayer and will appear on his sixth studio album "Paradise Valley," due out Aug. 20.

Listen closely for Katy's giggle near the end of the song. "I think that's just a love giggle," she explained on Sirius/XM's The Morning Mashup. "It's like the ones that Mariah Carey had in 1990 and stuff like that. Yeah, I think I was going for that, I think I was just so happy…I love that song, you guys will hear it soon, all you listeners."