Serena's big secret of GOSSIP GIRL is finally out: She feels like a murderer because some creepy aspiring rapist overdosed instead of molesting her. She confessed to Blair, Nate and Chuck — or, as B. dubbed them, the "Non-judgmental Breakfast Club." S. was so horrified by her secret that she allowed Dan to think she had cheated on him instead of confessing she's a "killer." The lie was enough for him to hoof it and end up being comforted by "Sarah" (actually Serena's former partner in crime, Georgina, who set up Serena's fatal tryst! Ironic much?). Sarah/Georgie's masquerade came out, but she was able to spin it to her advantage. Michelle Trachtenberg has been a revelation as the sinister G., especially to anyone who only knew her only as BUFFY THE VAMPIRE SLAYER's Dawn. Leighton Meester was surprisingly effective in BFF mode; the glare she gave Chuck after discovering Georgina's whereabouts was a mix of self-satisfaction, anger and predatory glee. The night's other most significant event: Lily left her own wedding rehearsal dinner and ended up at Rufus' concert — where she kissed him. Finally! And Vanessa finally maneuvered Nate into asking her on a proper date, but it was screwed up by Georgie's presence. How lame was Dan, leaving his own father's concert while in thrall to Georgina? Then again, he's only a guy, and he'd just had his heart broken, and Georgie is easy on the eyes...