That tiny, no-nonsense woman berating Blair (Leighton Meester) at the end of the ep is Sylvia Weinstock, the Queen Of Cakes. She is the wedding cake designer for NYC's elite, so it's no surprise that Blair brought her in.
Good thing, too – Sylvia's amazingly intricate buttercream sculptures are out of this world, and her skills may come in handy, because at this rate she's going to have to squeeze two or three miniature grooms on top of the cake.
Giovanni Rufino/The CW 2011 The CW Network
We're not sure what anniversary Studio 54 was meant to be celebrating during this episode. The famous nightclub – the epicenter of the 70s disco scene – opened its doors as a club in September 1977, making this roughly the it’s 34.2nd anniversary.
Maybe that's why no one made it to the party there. Or maybe it's because they remembered that Studio 54 hasn't actually been a dance club since 1991.