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The actress braves the heatwave for David Letterman. Plus: Jessica, Lindsay, Keira and more

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Michelle Williams and Heath Ledger join Ellen DeGeneres at the Chateau Marmont on Saturday, where the talk-show host (and girlfriend Portia DeRossi) threw a cocktail party to help Ugandan villages (through FXB and Heifer International). "It feels like Africa right now," DeGeneres said of the 100-degree weather. "So it's like we're there."

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