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Master of Ceremonies Hugh Jackman welcomed fellow Aussies Naomi Watts and Isla Fisher to the fourth annual Veuve Clicquot Polo Classic on New York City's Governors Island. Taking a brief break from her summer vacation to attend the event (which raised funds for The Urban Zen Foundation's Hope, Help & Rebuild Haiti initiative) Watts discussed her love of the sport of kings. "I don't know much about the finer points," the actress admitted. "But I did date a polo player a long time ago." Click through the gallery to see Jennifer Aniston, Kate Middleton, Kristen Stewart and more stars at the weekend's hottest parties!