Movie star KEIRA KNIGHTLEY is "relieved" to be taking on a new role in latest movie ATONEMENT, because it's more of a challenge than her part in the PIRATES OF THE CARIBBEAN series. The Pride and Prejudice actress stars alongside James McAvoy as star-crossed lovers in the movie, which is based on the Ian McEwan novel. And the English beauty is grateful for the new role, because it has more depth than that of her Pirates character, Elizabeth Swann.

She tells British film magazine, Empire, "This is such a relief. Not that I don't enjoy all that Pirates stuff, but it's not about my character - it's about Johnny (Depp)'s character. It's not focusing on emotional turmoil. It's been great just to get my brain engaged. "

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