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Keira Knightley has revealed that she's not scared of doing sex scenes.

The Never Let Me Go star said that getting nude for a role is not a big deal because everyone on set is often "respectful" and she always discusses what she is comfortable with beforehand.

"It's a consensual thing. You say what you're comfortable with and everybody's incredibly respectful," Contactmusic quoted her as saying.

However, the 25-year-old actress was not so comfortable with auditioning as a child because she believed everyone thought she was "s**t".

"Some kids did karate, I went to auditions. They were humiliating. You walk in a room and they obviously think you're s**t. So you walk again. I mean the rejection level of anyone who does anything like that. It is quite a savage process," she told The Daily Telegraph.

Actress Keira Knightley has denied Internet rumours that she refused to have her breasts digitally augmented for The Duchess promotional campaign, insisting that the subject never came up.

"I don't remember anybody telling me that they wanted to give a boob job to the poster, so I'm glad they didn't," Fox News quoted Knightley, as telling Pop Tart.

Knightley also said that off screen she doesn't feel the need for enhancing her chest and is very proud of it.

"I'd love to say that I was really strident and went 'absolutely not' if they'd asked to enhance my breasts. But I don't remember it ever coming up, which is rather nice," she said.

It has also been reported that Knightley was more than willing to set her hair ablaze for her act in the flick.

"I think the insurance people said, ''You've shot half the movie, and if she goes up in flames then we're not going to be able to finish it. So you're not allowed, So it is actually computer graphics," Knightley said.

Knightley, who is portraying the role of a mother in the flick, revealed that the motherly feeling didn't get on to her head.

"I don't want one (a child) thanks. I'm all right," she said with a laugh. "Never say never, but right now I'm fine. Thank you very much," she said.

Actress Keira Knightley has revealed that she hates red carpet events because people criticise her appearance.

Talking to Allure magazine, the 22-year-old actress said that she feels disgusted when people grade her looks and make unpleasant comments.

"All these people were coming up to my face and screaming, 'seven out of ten!' – referring to the way I look," the People quoted Knightley, as saying.

"And you think, you rude f-----.”

"I hate red-carpet events; I absolutely hate them. I don't like the fact that people write, 'Oh, you look like crap' in print. Or 'I don't like your arms,'" she added.

Knightley also said she has self-esteem problems.

"I'm not Wonder Woman. I have self-esteem problems. Everybody does. You know, skinny people are allowed to feel s--- about themselves,” Knightley said.

Knightley 's grandmother and great-grandmother both suffered from anorexia; therefore she gets offended when people criticise her weight.

"I haven't got a clue about how much I weigh. I do not own any scales," she said.

"And I have noticed it creates an anger in people who are not skinny. People like to blame their insecurities on other people," she added.

Keira Knightley steamed up the lens with her new curvy, nearly bare-all pics for cosmetic giant Chanel.

The 22-year-old, who had a carefully-placed bowler hat in the pic, gave a glimpse of her twin assets.

Earlier, the actress was seen in King Arthur American posters as a buxom beauty, but she told a US magazine that the promotion poster was not original.

"Those things certainly weren't mine. We had an interesting discussion when they said, ‘we want to make them slightly larger and you'll get approval’ and I was like, 'OK, fine. I honestly don't give a s***'" Daily Mail quoted Knightley, as saying.

The new femme fatale Knightley, who has been known for her tomboyish look since she appeared in ‘Bend it like Beckham’, once spoke about her dislike of her chest.

"I don't have any t***, so I can't show cleavage,” she said.

The ‘Pirates of the Caribbean’ beauty insisted that Chanel’s Coco Mademoiselle was the first ever ‘women’ perfume she wore.

“It is the first women’s perfume I’ve ever worn. I need something clean,”

Knightley is thought to have signed a one-year contract worth more than 500,000 pounds to be the face of the scent.

Keira Knightley feels “liberated” filming sex scenes.

The 22-year-old actress - who first bared her breasts when she was just 15 in ‘The Hole’ says stripping off for her steamy love scenes with co-star Edgar Ramirez in ‘Domino’ was easy.

She said: “Sex scenes are easy. I don’t really have a problem with them.

“Actually it’s quite liberating in the movie ‘Domino’ to be out in the middle of the desert completely topless with a beautiful Venezuelan guy. I was very lucky.”