The plot will center around Serena mother, Lily van der Woodsen (played on GG Kelly Rutherford) and tell the story of how she came by it is today and how it ultimately responds Rufus Humphrey. The statement read. The much buzzed about Gossip Girl Spinoff has been given the green light and that not even the best news. The most exciting (for me, anyway) is that it plays in my favorite decade - the 1980, which means that music and the clothes are just fabulous. Used to be a get that a wealthy Montecito attend college and live the high life, Lily is now forced to be a no , who live in the depths of the valley, once made fun of, and go to school, Warner Bros.