Blair's planning a baby shower like no other. Her prince gets culty and tells her that she needs to distance himself from her frienemies.
Nate brings his grandfather in to meet his boss, Diana, and gramps pretty much tells her to let Nate take over the Spectator, which he has a controlling interest in. Meanwhile, Diana has fired Charlie/Ivy. She's upset, but she also has to deal with her ex, Max, who wants to expose her lies.
Dan and Chuck don't get invited to the shower, so they hang out together and Chuck says he'll help Dan overhaul his image.
In her efforts to beat Gossip Girl, Diana finds out that Nate has a list of all of GG's contributors. Nate wants to publish it, but Serena stops him, because she's actually tipped the gossip maven off quite a bit over the years. In the end, Louis releases it to the Spectator, and exposes everyone.
As might be expected, Blair's shower is Tiffany-themed. Dan crashes the shower, with a bottle in tow. Chuck follows closely behind him, with futile hopes of stopping him. Blair accuses Serena of not really being her friend and Serena tells Blair that Louis was the one to release the list to the Spectator. Blair confronts Louis and he gets defensive and puts down all of her friends. She tells him to get out.
Motive unknown, but Diana takes credit for leaking the information and steps down from her post. Chuck tells Dan that he's really in love with Blair. Mac ups his blackmail price to Charlie/Ivy from $50k to $500k. Nate becomes the new editor of the Specatator. Blair heads straight to Chuck to make up with him.