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Michelle Trachtenberg, Connor Paolo, Gossip Girl

Giovanni Rufino / The CW

Something wicked this way comes, and her name is—you guessed it—Georgina Sparks!

Insiders and the show's CW rep confirm that Michelle Trachtenberg will be coming back to Gossip Girl for the very last episode of the current season, which is starting to sound crazy good.

"There's a big scandal involving a certain guy you know," Michelle tells me. "She's back for vengeance."

So what's she doing up there in that photo with Serena's little bro, Eric? Well...

Turns out Michelle has actually stolen Eric (Connor Paolo) over to her own show. NBC confirms Connor is visiting Michelle's show Mercy this very week for a guest spot, playing a kid who sets off a pipe bomb on a commuter bus. (The episode is set to air March 3.) So it's a trade-off of sorts.

Still, on Gossip Girl, you can bet that Georgina will dig her claws into at least one of the Upper East Side guys when she returns for the season ender. "There will be a scandal involved," Michelle tells me of her return, then adds with a laugh: "I know, shocking. But they sent [Georgina] away to a fake prince this time, so she's gonna be pissed. And her vengeance involves a certain guy."

So who is it? "It's Chuck Bass' dead father!" Michelle teases. "I bring him back from the dead! No, I don't. But that would be really creepy. That would be the story if I were still on Buffy."

Ahh, Hellmouth, we miss ye.

Michelle Trachtenberg, Leighton Meester

Courtesy: Albert Michael/startraksphoto.com

Michelle says we can probably expect more catfighting with Blair, too: "It's so funny because Leighton [Meester] and I are so close and we always have to say, 'I hate you!' but it's like, 'I don't really hate you, I love you!' At her performances, [Leighton] has me at the front row and, like, we sing to each other while she's singing up there. So, we're the cheeseball friends."

Are you looking forward to more of the "cheeseballs" catfighting on Gossip Girl? Which unlucky guy will Georgie dig her claws into this time? Could it have something to do with Chuck and Blair's breakup?