From The Frick Collection Young Fellows Celestial Ball, to the "Nymphomaniac: Volume I" screening, to The Collective launch at Bloomingdale's, there was no shortage of stylish guests around the city last night. Emmy Rossum rounded out her week of amazing looks in Altuzarra, while Hannah Bronfman defended her 'best dressed guest' status in yet another stunning number. Click through to see who else caught our attention in NYC on Thursday night.