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The singer dances up a storm during a Today show performance. Plus: Britney Spears, Halle Berry, Bruce Willis, and more

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CHILLER THRILLER

Josh Hartnett braves the frigid New York temperatures Thursday, all in the name of art – he's in town filming the mistaken-identity thriller Lucky Number Slevin. The actor will next be seen – fully clothed – in the crime drama Sin City, due out April 1.

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