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Keira Knightley poses as Britney Spears for confused fans

Keira Knightley poses as Britney Spears for confused fans
Actress Keira Knightley attends the premiere of "Anna Karenina" during the Toronto International Film Festival on Friday Sept. 7, 2012 in Toronto. (Photo by Evan Agostini/Invision/AP)
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LOS ANGELES - Actress Keira Knightley has a bizarre doppelganger - she is frequently mistaken for Britney Spears.

The clean-cut "Pirates of the Caribbean" star insists fans often mistake her for the former pop wild child when she is out and about in California.

The British actress admits she is more often confused with fellow screen stars Natalie Portman and Kate Winslet, but it is the Spears comparisons that always catch her by surprise - and she is happy to play along and pretend she is the pop princess.

Knightley tells U.K. talk show host Graham Norton, "It has happened to me three times in L.A. I was quite excited by that and definitely signed and had a picture!"
Photos: Pregnant royal Kate visits students in London