Katy Perry: My grandmother keeps me grounded

London: Pop star Katy Perry says she relies on her grandmother to stay grounded.

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" hit maker 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 but I won`t go away. What I need to do is let the dust settle and take the temperature of what the world wants musically.

"I am definitely going to recharge because you can get over-exposed and I am balancing that tightrope at the moment, having my own movie about myself," she said.