Mindless Behavior Show Off Their Grown-Up Swag With John Mayer And Katy Perry (PHOTO)

Mindless Behavior, Katy Perry, and John Mayer are totally making plans for next week... we're guessing. Mindless Behavior are quite the dapper, super-swagged out dudes (and still in high school, we might add). But despite their age, we know they are DEF on some grown-up ish from their latest single "Keep Her On The Low,"