British actress Keira Knightley is to turn her back on major Hollywood roles - because they do not challenge her emotionally. The Atonement star, 22, says she "cannot imagine" doing another big-budget Pirates Of The Caribbean-style movie.Instead she wants to concentrate on quirky small-budget films which stretch her acting skills. She says, "I can't imagine ever doing another one. I had five months off from Pirates during the summer last year, when I made Silk and Atonement, and it was so great - I want to be able to explore emotions in smaller projects."That's not to say I won't suddenly read a big Hollywood blockbuster and go 'oooh, that might be good...' But I haven't yet." Knightley reprised her role as Elizabeth Swan in the third installment of the Pirates of the Caribbean franchise this summer. While it did well at the global box office it was treated harsly by many critics.However Knightley's current film Atonement, which opened Venice Film Festival, has been hailed by the critics and is widely expected to recieve a handful of Oscar nominations including Best Picture.

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