[Michelle Trachtenberg on set of Gossip Girl, Photo via Gawks]

Looks like Harriet the Spy is sniffing out a story on the Upper East side today, in character as GG's Georgina. Wonder if her bff was around taking notes for her own big debut? Who are the guys in the background and why are they acting unphased??? Don't they realize that they are witnessing history here?

[Michelle Trachtenberg Is A Gossip Girl]
[Lydia Hearst The Newest Gossip Girl]