Last night, Chanel turned New York blue—literally. To celebrate the U.S. launch of Bleu de Chanel L'Exclusif, the French house took over the penthouse at 1 Madison with a guest list stacked with buzzy actors, musicians, and downtown It kids. I walked in and immediately spotted Evan Mock in front of the step and repeat, Christopher Briney, who arrived later and was immediately surrounded by flashing bulbs, and Teyana Taylor, who arrived in the pearl-heeled Chanel boots that are on everyone's...