Merchandising for the movie includes a toy figure of her character, Elizabeth Swann. But Knightley said: "It’s nothing like me."

The star of Bend It Like Beckham and Pride And Prejudice recently claimed she may quit the movie business because she is tired of fame.

And she told Total Film: "The pressure the entertainment industry puts on young women is sick. And it’s not so much what pictures they print or what they say. It’s a young woman being followed around by five men who could be anyone and you have no way of telling who they are - if they are actually legitimate photographers or in fact potential rapists. It’s terrifying."

Keira: I wish I was like Sienna - May 8 2007
Keira Knightley has apparently admitted she envies new co-star Sienna Miller’s "party personality" - and wishes she had more to say at glam showbiz events.

The 22-year-old, who was due to start filming The Best Days Of Our Lives alongside Sienna yesterday, is quoted by the Daily Express as saying: "At parties I can never think of a thing to say.

"I wish I was Sienna Miller. I watch that girl and she’s fabulous. She talks to everyone and laughs and smiles. When I talk to her, I hope a bit of her party personality will rub off on me but it never does."

The Pirates Of The Caribbean star added that she also feels out of place on the red carpet.

"I’ve become phobic about the red carpet because you just get so scrutinised and all I think is, I’m going to be in the Top 10 worst dressed list tomorrow.

"I try, I really do, but I’m just no good at that stuff," she sighed.

I want to get a life, says Keira - May 2 2007
Keira Knightley has revealed she wants to quit acting, saying: "I want a life instead."

The 22-year-old Pirates Of The Caribbean star said the pressures of fame have become too much.

And she’s "devastated" at becoming a poster girl for anorexia because of her slender frame.

Speaking to Elle magazine, Keira said of her career: "The celebrity thing is completely crazy. I think I just have to move away or give it up altogether.

"I couldn’t have kids in the situation I’m in now. But I could just do something else. That’s probably what’s going to happen. I’m just not so hungry any more. I made a decision very recently that I wanted a life instead."

Keira reached her decision after a trekking holiday in the Himalayas.

"I spent 10 days in a place where no-one knew me or cared what films I’d been in," she said. "I got to have some total peace and balance and see myself as a tiny insignificant speck - something I really needed."

The actress spoke of her upset over pictures of her appearing on pro-anorexia websites.

Keira said the "physically gruelling" schedule for Pirates had caused her to lose weight.

She eventually asked the doctor how to become a size 12 - but he told her she’d have to eat unhealthy food and stop exercising.

"Basically, my body type is naturally thin. There’s nothing I can do about it," she said, adding: "I hate the fact that naturally thin women like me are becoming scapegoats for promoting a mental illness."

Nudity no problem for Keira - April 23 2007
Keira Knightley has revealed she enjoys stripping off for the camera because she finds sex scenes "liberating".

The gorgeous 22-year-old was just 16 when she had her first nude scenes, in 2001’s The Hole, and also had to bare her breasts while playing bounty hunter Domino Harvey in 2005.