Blair and Serena, who go to an exclusive private school in Manhattan, are no longer best friends but are still both consumed with thoughts of boyfriends and college. In this sequel to "Gossip Girl, " brunette vixen Blair Waldorf is turning 17, and she knows exactly what she wants--Nate, her studly, troubled boyfriend of three years. But Blair's been too busy filling out Ivy League college applications to notice that Nate has found himself another playmate