From The CW:

The privileged prep school teens on Manhattan's Upper East Side first learn that Serena Van Der Woodsen (Blake Lively, "The Sisterhood of the Traveling Pants") is back in town the way they learn all the important news in their lives- from the blog of the all-knowing albeit ultra-secretive Gossip Girl. No one knows Gossip Girl's identity, but everyone in this exclusive and complicated vicious circle relies on her text messages for the latest scoop. Serena's closest friend, Blair, (Leighton Meester, "Surface"), is just as surprised as everyone else to find that Serena has suddenly ended her self-imposed exile to boarding school and returned to Manhattan. The tension between Blair and Serena isn't lost on Gossip Girl, who is determined to uncover and fuel any and all scandals. Does it involve Serena's brother Eric (Connor Paolo, "One Life to Live"), Blair's boyfriend Nate (Chace Crawford, "The Covenant"), or Nate's buddy Chuck (Ed Westwick, "Children of Men")? Maybe it has something to do with Dan (Penn Badgley, "John Tucker Must Die") and his sister Jenny (Taylor Momsen, "Spy Kids 2," "How The Grinch Stole Christmas"), whose middle-class background keeps them on the fringes of this exclsive clique. Even the parents-from Serena's mother Lily (Kelly Rutherford, "Melrose Place"), a fomer ballerina/rock groupie, to Nate's high-powered father Howie "The Captain" Archibald (Sam Robards, "The West Wing"), to Dan and Jenny's dad Rufus (Matthew Settle, "Brothers and Sisters"), a former rocker turned art gallery owner-are aware that their sons and daughters are constantly checking their Sidekicks to read Gossip Girl's latest sightings and overhead titbits. Overriding all the shifting friendships, jealousies, and turmoil in this wealthy and complex world, the central mystery remains-Who Is Gossip Girl?

Based on the popular series of young-adult novels by Cecily von Ziegesar, "Gossip Girl" is from Alloy Entertainment in association with Warner Bros. Television and CBS Paramount Television Inc. with executive producers Josh Schwartz ("The O.C.") & Stephanie Savage ("The O.C."), Boby Levy and Leslie Morgenstein ("Sisterhood of the Traveling Pants"). Mark Piznarski ("Veronica Mars," "Friday Night Lights") directed the pilot.