New York's It Crowd had a serious case of Thursday Night Fever this week, partying into the wee hours at MONTSERRAT's Studio 54 soirée at Mr. Fong's.

The cult favorite brand, known for its lively bashes, took over the Lower East Side spot in celebration of their new Jet Set collection, a line of silky two pieces that's guaranteed to make you the life of the party.

Curious what you missed and, most importantly, who wore what? 

Click through for an inside look at the exclusive evening!

[Photos by BFA/Jason Crowley]