It's Gossip Girl's unforgettable final season. As season six begins, Serena is off the grid, Blair has offered Chuck her heart, Dan has written a new book and Nate determines to reveal Gossip Girl's true identity. And when Bart Bass, Jack Bass and Georgina Sparks show up to raise hell, it's a fight to the spectacular series finale. So who comes out on top? That's one secret I'll never tell.... XOXO.