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30 September 2013, 15:41 | Updated: 30 September 2013, 15:42
The 'Roar' singer also says she thinks her musical style will become more folk oriented in future.
Katy Perry has described boyfriend John Mayer as a "genius" who should donate his brain to science when he dies.
The 'Teenage Dream' singer has also opened up about where her music may go in the future, hinting at a more folk style sound for her next release.
"He literally is a genius, as is evident from his songwriting," Katy told Billboard this week. "I always tell him, 'Darling, you know I'm going to have to give your mind to science after you've passed, because we're going to have to understand how all these sparks work'!"
The 'Firework' singer also says her musical style is always changing and predicts a shift of sound as she approaches her thirties.
"I'll probably turn into more of a Joni Mitchell," Katy predict. "As I inch towards my thirties I think my fourth record will be more of an acoustic guitar album."
Check out a picture of Katy Perry out in London for dinner over the weekend below (Credit: Splash):
This week Katy unveiled and released a brand new song called 'Walking On Air' as a teaser for her third studio album.
Katy Perry officially releases new album 'Prism' on 21st October.