>> INSIDER WIRE —After all the Alaia-related Costume Institute Gala drama yesterday, we wondered if anything would top it all at the actual event.  Well, a drunken reveler managed to step on and ruin Natalia Vodianova's vintage Fortuny dress (a gift from husband Justin Portman seven years ago) at one after-party, and at another, it's rumored that Keifer Sutherland headbutted Proenza Schouler designer Jack McCullough, breaking his nose.  Apparently, the actor was upset over Brooke Shields?  It's all very hazy . . . [Guest of a Guest]