The best part of living in New York City is that "disco black tie" is a comprehensible dress code and a night spent dancing at one of the most regal museums in the world between Carolina Herrera, Nicky Hilton, and Emmy Rossum is just a casual Thursday. Last night we toasted to the Frick Collection at its Palladium Nights Young Fellows Ball, presented by Carolina Herrera. When we weren't trying to get Bill Cunningham's stoic attention or checking out the new van Dyck exhibition, we found ourselves filling up on Belvedere gimlets, mingling around the fountain, and getting our Saturday Night Fever on on the dance floor. Of course the fête called for a glamorous ensemble, and the society queens and A-listers in attendance did not disappoint. Click through for some of our best dressed picks!

Go HERE for more photos by Sunny Norton and tag yourself and your friends!