Serena van der Woodsen (Blake Lively) and Blair Waldorf (Leighton Meester) are two of the most scandalous, cutest girls on the Upper East Side. These old friends are also rivals at points - particularly when S' past indiscretions with B's boyfriend are discussed.
Tonight is the night of the ball where Serena van der Woodsen makes her debut. But will Serena (played by Blake Lively) be the slightest bit happy about it when she learns what her mom and grandmother have been up to behind her back?
Despite the efforts of Serena's evil grandmother, Dan sticks it out and wins the affections of Serena at the ball. It helped that Lily stood up for him - and herself - by swallowing her pride and admitting she'd been unfair.
Serena and Blair have their differences, and certainly some things in the past have strained their relationship, but they remain close, and are in the process of working things out between one another.