Perry, 29, says her assistant, Tamra, becomes her punching bag, on the days she is stressed, reported Contactmusic.
"I am quieter (on such days). I can snap a little bit, be a little bitchy to the couple of people around me. Tamra, my assistant, is my closest punching bag. But she's strong and understands that I have a lot of pressure on me sometimes," Perry said.
She added that she takes help of meditation to calm herself.
"(I meditate) five to six times a week and have act-out day about every four to six months. I'll have a cigarette, which I know is absolutely horrible for me, after a few drinks when I'm having a week off. I don't do black tar heroin," the singer said.