George Clooney and his wife, human rights lawyer Amal Clooney, the event played host to a glittering star-studded guest list.
Among the cavalcade of celebrities who flooded into the New York Public Library for the fete, Julia made a splash in a striking gown.
Her sleek dress was black other than a pink, white and burnt-orange striped section stretching from her midriff to her decolletage.
The Eat Pray Love star teamed the gown with a matching jacket that she flung fashionably over her shoulders without putting her arms in the sleeves.
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