By People Staff
October 04, 2007 12:00 AM

It was Ivy League mixer night at the prep school, and in addition to parents, anxious students and college reps, it brought out claws!

Blair continued to sharpen hers on Serena, using Chuck’s (erroneous) scoop that Serena had been in rehab. Only after potentially ruining her former BFF’s chances at admission did Blair seem even the tiniest bit remorseful, sharing with Serena her own family secret: Her dad left her mom for a younger model. A younger male model! And, as always, there were plenty of snappy quips from the mouths of the Constance Billard and St. Jude babes.

And tell us: Do you think Blair and Serena are REALLY going to call a truce in their diva war? –Kimberly Potts