Sure, the clothes are great, but the reason Fashion Week is so exciting in New York is because you never know who you'll glance over and realize you're a champagne bottle's length from at any given party. Such was the case at last night's Rosetta Getty bash with h.wood Group at the Gramercy Park Hotel's infamous Rose Bar. Is that Keira Knightley over there gabbing and laughing with her husband? Yes. Was that Alexa Chung who just walked by Matt Hitt? Yes and yes. The late night fête celebrated Getty's new Spring/Summer collection and raged on into the wee hours - we don't usually stay out 'til 2 am, but when we do it's at Rose Bar. Mia Moretti hit the decks before Balthazar Getty closed out the evening, entertaining the likes of Phoebe Collings James, Cleo Wade, and Fuschia Sumner, who along with Moretti, co-hosted the event. Even Derek Blasberg made an appearance! Click through for an inside look!

[Photos courtesy Jamie McCarthy/Getty Images]