You know you're a Katy fan... when you are trying to show your boyfriend the sexual moves she does on stage and then totally get stuck on the floor with cramp!
Don't I wish my girlfriend was hot like that?!
You know you're a Katy fan when you wake up one morning realising you've used up all the tour tickets and so you fetch your iPad and bank card to buy more, then go back to sleep as the day's work seems to be done with that.
You know you're a Katy fan when the supermarket no longer needs to give you a plastic bag
because you've got your own prismatic world tour Katy Perry shopping bag