Pirates of the Caribbean: The Curse of the Black Pearl (2003)
After appearing in a couple of shorts, Knightley nabbed a role in Jerry Bruckheimer's theme-park adaptation that became the unexpected hit of the summer.
As Governor's daughter Elizabeth Swann, she's mainly on damsel-in-distress duty, but she does get to limber up as the film progresses, giving good feist in a couple of action scenes, and drunkenly sparring with Jack Sparrow (Depp, of course). A rollicking adventure that's not dampened one jot by the disappointing sequels.
Glamour rating? There's plenty of corsetry on display here.