Katy Perry has showered praises on her boyfriend John Mayer, insisting that the 'Say' singer is a genius, which is evident from his songwriting.
The 'Roar' hitmaker explained to Billboard Magazine that she is planning to donate Mayer's mind to science after he has passed, to understand how it works, Contactmusic reported.
The 28-year-old brunette beauty added that Mayer can finish word puzzles in less than 10 minutes and he is very determined.
Mayer had recently complimented Perry, describing her single 'Roar' as a "massive" track and an experience in itself.