Jessica's sis goes on location for "Boyfriend." Plus: Christina Aguilera, Sienna Miller, Denise Richards and more

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MIDDLE GROUND

Uma Thurman and Ethan Hawke team up for a play date with their children Maya, 7, and Roan, 3 (not pictured) at a New York City park on Thursday. The actors, who were married for five years, split in 2003.