The French designer was synonymous with striped sweaters and Left Bank insouciance.
The music star had launched the collection last February during New York Fashion Week.
Cuts may be coming to Condé Nast.
Hannah Bronfman, Gabrielle Union, Margherita Missoni and Padma Lakshmi were among the guests to join the designer at the celebratory rooftop feast.
Jones Group’s Richard Dickson said that freestanding retail stores could be in the designer’s future.