Gossip Girl Fashion Quiz: Episode 8 "Seventeen Candles" A poopy birthday. We've all been there. Though I can't recall my 17th birthday, I know I wasn't wearing a fabulous Valentino LBD. Such is the life of the young and rich upper Eastsider, in particular, the birthday girl, Blair Waldorf. You can't always get what you want — that is the lesson Blair has finally learned.