Two Kardashians walk into a bar.

That’s not the beginning of a joke, it’s just what happened tonight in Paris, when Kris and Kendall Jenner came to Balmain’s after party. Held at the historic Lapérouse bar and restaurant  (a place ten years older than America), the bash was mobbed with models, stylists, editors, and that guy from Muse. What really happened behind the tightly guarded antique door? Scroll through for exclusive details of the week’s hottest dance party.