Katy Perry gushes over John Mayer Mon-30-Sep-13 09:12 Share this By Jay-Jay FeeneyKaty Perry has been gushing over her boyfriend John Mayer, saying, "He literally is a genius... 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.' We'll be in bed, and he'll be doing the crossword puzzle. Every night, he tries to finish it in under 10 minutes." You May Also Like See John Mayer and Katy Perry’s First Portraits Together - Photos Katy Perry 'Unconditionally' - the video Katy Perry's dramatic 'Unconditionally' video - the teaser Become a fan of The Edge on Facebook and on Twitter .