Knocked Up star Katherine Heigl is sick of Hollywood’s obsession with the thin and beautiful - because she is tired of constantly trying to fit in to the movie industry’s ideal image.

The Grey’s Anatomy beauty, who has become one of the industry’s leading new actresses, understands she is required to look good on-screen, but can’t seem to attain Hollywood’s high standards because of continually changing trends for the body beautiful.

She says, "I understand what it is I am trying to sell and what it is I want people to buy. I’m never going to be a size two (U.K. size six) but I do try to maintain a certain look that appeals.

"Unfortunately, it keeps changing - it went from uber-thin and then that was wrong, then it went to curvy, and then that was wrong. It’s like, ‘God, what do you want?’ I can’t reform myself every time the trends change."

And the star, who was forced to lose weight for her breakthrough movie Knocked Up, finds it strange how Hollywood can’t except her just the way she is.

She adds, "I always thought I was normal. And I was normal, but just not in Hollywood."