Keira Knightley confessed she hates her famous pout.

The beautiful actress believes her trademark facial expression tends to make it more difficult for her to convey vaired emotions on film.

She said; "The pout means I'm being c**p, like my face is frozen in this one look of surprise, and that's hardly helpful for conveying complex emotions.

I think I was really pouty when I was 16 or 17 and that's when my first films came out, and it's sort of stuck.

When I'm nervous my neck gets really, really tense and then that pressure sort of squeezes up to my lips and they push out and well, there you go, that's the pout."

Keira also admits she is determined to prove herself as a serious actress in the business.

She said; "Since my first films, like 'Bend it like Beckham', I've always been looking to be stretched, it doesn't always mean I'm going to be good, but I'm trying to be a good actress, I really am."

Meanwhile, Keira confessed she was embarrassed of the Pirates of the Caribbean franchise when she first signed on to star in the blockbuster movies because they're based on a theme park ride.

She said; "Gosh, I was just a teenager and you can imagine it was the most embarrassing thing telling my mates I was about to be in a movie based on a Disney theme park ride.

I mean it was really f**king embarrassing and we all thought it was going to be total s**t anyway.

But then suddenly I was kissing Johnny Depp and Orlando Bloom and bang, there you go, instant bloody stardom."