If you didn't read Cecily von Ziegesar's Gossip Girl in the early 2000s, you seriously missed out. Yes, you probably know Serena, Blair, Chuck, Dan, and Nate from the hit TV show, but even if you've watched and rewatched the series, the book versions of these characters will still manage to surprise you. Whether your friend is dying to throw it back to the good old days or they're diving into the joys of the early millennium for the first time, Gossip Girl is a quintessential choice.