This week on the most important television series ever made about New York, we met Serena Van der Woodsen's grandmother, a drinky dowager who is not only mean and classist but also a Shatnerianly terrible actress! How did she give birth to Serena's mom, who is a fantastic actress? Maybe acting skills skip a generation in their family, thus explaining Serena. Also on last night's episode, Blair and Nate got back together, breaking the heart of Chuck Bass and causing him to skip town, all turtlenecked, for parts unknown. U.E.S. teenagers waltzed gracefully at cotillion and "hipsters" milled about at Dan's mom's opening at the 'Bedford Avenue Gallery.' Now we understand how people who live in Orange County, California felt about "The O.C."