"My first memory of Hermès is the orange boxes my dad brought home for my mom when I was a kid," said Chloë Sevigny at the opening of the French house's Wall Street outpost on Thursday night. "They used to make her so happy." Rachel Weisz, Leelee Sobieski, Kevin Bacon, and Kyra Sedgwick were among the other A-list guests who ventured downtownway downtownto ogle the luxe wares at the new store. After cocktails, they all reconvened at the nearby Cunard Building, which was lavishly transformed into a Versailles ballroom, complete with stilt walkers wearing horse heads strutting on a carousel of steel horses, and a garden of foliage, hanging vines, and piped bird song. The evening's surreal quality grew when the Hoofers, a troupe of tap dancers, began a performance that thundered through the hall. "Of all the parties I've been to in New York," said designer Erin Fetherston, "this has got to be the most mind-blowing and original one ever."