Last night, Lena Dunham and co held the NYC premiere for the third series of Girls (starting here on 20 January on Sky Atlantic) and it was quite the snazzy event. Celebs in attendance included Karlie Kloss, Nicky Hilton and a certain Ms Anna Wintour (wearing a Prada coat) which has sparked even more Lena Dunham Vogue cover buzz. But, it wasn't the faux-NYC subway built for the after-party that everyone was talking about, or the fact that Adam Driver wasn't there (Adam, where were you?). Instead, the topic of the day was the sheer amount of Snapchat-ing going on. Haven't added them yet? Well, hurry! @GirlsHBO is only on the social media app for another day.