3. Cecily von Ziegesar's "Gossip Girl" Book Series
Adapted For: TV ("Gossip Girl")
Starring: Leighton Meester, Blake Lively, Chace Crawford, Ed Westwick, Penn Badgley, Taylor Momsen and Jessica Szohr
Fun Fact: Blake played Bridget Vreeland in "The Sisterhood of the Traveling Pants" and "The Sisterhood of the Traveling Pants 2," which are based on books published by the same company that published the "Gossip Girl" book series.
RELATED: See Leighton and Blake looking sexy
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