Serena "celebrates" with her mom, Lily, who just got engaged to Bart Bass. Brother Eric is there... as is step-brother Chuck Bass! Serena also learns that Dan was right - strings were in fact pulled to get her off the hook for the pool party.
Nate tries to cover for Blair, thinking it was she who let the kids into the pool. But the headmaster calls his bluff. D'oh! Nate can't seem to do anything right... even fall on his sword (so to speak) for his dream girl!
Couple that wasn't Blair and Chuck argue again... the gist? Her virginity and faking it for Nate. He wants Blair and threatens to tell Nate what happened. Oh, and Vanessa is filming this as part of a documentary of some sort.