The singer joins Destiny's Child, U2 and Stevie Wonder to aid African poverty. Plus: Britney Spears, Paris Hilton, Jennifer Connelly and more

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Jennifer Connelly remains cool as she makes her way to the New York studio of the Late Show with David Letterman on Thursday, where she discussed her fear of flying, her two sons, Kai and Stellan, and her horror film, Dark Water, out Friday.