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Stars' Favorite Winter Sports!

From Paris Hilton to Pamela Anderson, see how celebs are staying fit during as the temperatures drop


Duff bundled up and walked her way to cardiovascular health during the AIDS Walk in New York City – but her heart wasn't the only thing she she was keeping healthy. Studies suggest that doing good deeds, like getting out in support of a charity, can accomplish everything from decreasing the giver's stress-level to increasing her long-term happiness.