Another arrival that made waves: Pussy cat Karlie Kloss, regrettably on the arm of H.R.H Derek Blasberg… What was she wearing? Cushnie et Ochs? The Observer was curious, but before we could inquire, she had pranced off to the next room of Maison Cartier.

Bade Iscil… a name unknown to us appeared to be stoned, blacked out or just crazed. She sashayed, Cartier cuvée in hand— like the sultan of Brunei—with such a glazed face . But when she slithered up to Melissa Berkelhammer, it all made sense…

Genevieve Jones drew double takes with her tropical Salvatore Ferragamo couture. (the Italian brand hosted a fabulous festa for its newly renovated Fifth Avenue boutique next door.) As did the svelte and mischievous Michelle Harper in some outré chic skirt/blouse combo.

Proud parents Beyonce and Jay-Z  dropped in at Skylight Studios for what had to be the most extravagant after party we'd been to in recent memory - we drifted off into a Cartier Cuvée induced haze as LCD Soundsystem's James Murphy gave our eardrums a deep tissue massage.

Click through the gallery for a taste of the evening.