AceShowbiz -

Blair's start as an NYU student is not as smooth as she thought with the arrival of one old enemy. Georgina makes her triumphant return to "Gossip Girl" on Monday, September 21 when she told Blair that they are roommates.

All Blair wanted to do is to maintain her Queen status in college and embark on her first day at the NYU with Dan and Vanessa. But Georgina's presence threatens the very foundation of her goal and may lead to Blair being a social outcast.

Meanwhile as Serena prepares to depart for Brown, she and Chuck have a major falling out, so she recruits Chuck's enemy, Carter, to help her get even. Nate and Bree who decide to explore their relationship further, knowing full well it could cause tension between their families who are political rivals.