ScreenCrave - Serena and Blair do best friends better than anyone. Those two are more than just pals, they’re sisters and they know each other inside and out. In last night’s episode of “Gossip Girl,” maid of honor Serena threw her BFF a ‘Blair Waldorf’ bridal shower to die for. Many of the Upper East Siders came together for this event – a couple even showed up uninvited. And surprise, surprise all hell broke loose!