Oh that Katy Perry, she must be starting to get delirious for her world wide mega tour, because she got all up in one of her fans business. But, in a funny way of course.

During a recent show in Melbourne Katie reached down and grabbed the phone out of a girls hand. Apparently she was on using the "Whatsapp" to message her ex boyfriend who was making fun of Katie Perry saying she can't sing live any way.  Say what? Oh no you didn't. See Katie Perry's reaction below: