Keira Knightley turns 40: a look back (20 images)

By Wade Sheridan

Actress Keira Knightley, best known for her roles in "Pirates of the Caribbean," "Pride & Prejudice," "Love Actually," "Atonement," "The Imitation Game" and "Anna Karenina," turns 40 on Wednesday. Here's a look back at her career through the years.

Keira Knightley poses as she arrives for the Hollywood Awards in Beverly Hills, Calif., on October 18, 2004. Photo by Francis Specker/UPI

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Knightley (R) and Matthew MacFadyen arrive for the Toronto International Film Festival world premiere of "Pride & Prejudice" in Canada on September 11, 2005. The film is returning to theaters April 20 in celebration of its 20th anniversary. Photo by Christine Chew/UPI

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Knightley attends the British Independent Film Awards in London on November 30, 2005. Photo by Rune Hellestad/UPI

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Knightley arrives for the world premiere of "Pirates of the Caribbean: Dead Man's Chest" at Disneyland in Anaheim, Calif., on June 24, 2006. Knightley portrayed Elizabeth Swann in the "Pirates of the Caribbean" series. Photo by Phil McCarten/UPI

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