'Grey's' star keeps grounded thanks to family

Grey's Anatomy star Katherine Heigl has revealed that she relies on her friends and family to stop her from turning into a "diva".

The actress, who plays Dr. Isobel Stevens in the ABC drama, admitted that she has some "bad moments" on the show's set but has ultimately managed to stay grounded.

"Everybody has bad moments," Heigl told Cosmopolitan magazine. "There are people in my life who keep me grounded, so I couldn't behave that badly, even if I wanted to."

Katherine also revealed that one of the worst aspects of showbusiness is feeling pressured to stay in shape.

"I don't have a lot of discipline," she said. "If I wasn't in this industry I wouldn't work out. But I have hips and a butt and everything that goes along with that, including cellulite. So I do the best I can."