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It was a meeting of the redheads when Emma Stone (in J. Mendel) helped celebrate Ahna O’Reilly (in Issa) and Jessica Chastain‘s Best Ensemble Cast win for The Help at the National Board of Review Awards Gala, held at Cipriani 42nd Street in New York. When we caught up with Chastain separately, she told us she picked out her Zac Posen dress just for the big night. “This dress is so theatrical, but also very modern,” she said. “It’s feminine and edgy. I’m a huge fan!” See Keira Knightley, Carey Mulligan, and more stars at last night’s hottest parties in the gallery!