Welcome to Manhattan’s Upper East Side, where gossip rules and affluent prep-school students find themselves with the money, access and appetite to explore all the temptations New York City has to offer. Based on the best-selling series of young-adult novels by Cecily von Ziegesar, this drama, from “The O.C.” creator Josh Schwartz, is told through the eyes of an all-knowing blogger who is determined to uncover and fuel every scandal possible – including the intense rivalry between two girls, Serena (Blake Lively – “The Sisterhood of the Traveling Pants” movies) and Blair (Leighton Meester – “Veronica Mars”) – via her constant, avidly read text messages. When Serena unexpectedly returns home from boarding school, she stirs up an old love triangle, finds new romance and creates some powerful enemies. The series also stars Penn Badgley (“John Tucker Must Die”), Taylor Momsen (“Underdog”), Chace Crawford (“The Covenant”), Ed Westwick (“Children of Men”), with Kelly Rutherford (“Melrose Place”) and Matthew Settle (“Into the West”).