Last night in NYC, Tinsley Mortimer and Hannah Bronfman attended the annual Young Fellows Ball at The Frick Museum, Theophilus London DJ'd for Stylecaster's "50 Most Stylish New Yorkers," Victor Cruz and Katharine McPhee go to the Park Avenue Armory to see Audemars Piguet's Royal Oak exhibition, Mick Rock has his opening reception for The Legend Series, and so much more. Last night's parties were all about the spring attire!