Perry, 27, says her grandmother Ann Hudson, 91, "doesn't acknowledge" her success and can't understand the fuss that surrounds her famous granddaughter, reported Showbizspy.
"My grandmother is in the movie (Katy Perry: Part of Me) and she steals the show, she is living in Las Vegas and she doesn't acknowledge my success at all, which is exactly what I need.
"When she was at the Hollywood premiere she was like, 'Oh, why are you here?' and I was like, 'It's my movie', and she was like, 'Oh is it?' She thought everybody was there to see her!," Perry said.
The "Firework" hitmaker is now planning to take a break from music because she fears being overexposed.
"I will take a catnap, take a pause, plug into the matrix