Blair, Serena, Nate, Dan, and Vanessa went off to live their lives. Now they're coming home for the holidays. A lot can change in a few months . . . but some things never do. It finally happened: we went to college. We started over. No one knows who we've coveted, what we scored on the SATs,where our parents live, or when we became debaucherous. We've learned new things, made new friends, and maybe even met the loves of our lives. We've changed. Or at least, some of us have. But old habits are h