Casting Roundup: Michelle Trachtenberg Back on ‘Gossip Girl,’ Seinfeld Takes Regis’ Chair

Michelle TrachtenbergHalloween has passed, but Gossip Girl has yet to experience its most horrifying moment this season: the return of Georgina Sparks, played to wicked perfection by Michelle Trachtenberg. The most recent Sparks developments saw her skipping town after leaving Dan (Penn Badgley) with the son that, at the time, he believed was his. The diabolical manipulator of the Upper East Side will return once more on the series’ 100th episode, to air sometime in early 2012. Sparks’ return to Gossip Girl will mark an expectedly heavy sum of trouble for all in her path. Gossip Girl airs Mondays at 8 p.m. ET/PT on the CW. –TVLine

Back when Kathy Lee Gifford left Regis Philbin as the lone Live! host, a series of guest hosts were invited onto the show until the producers chose a permanent replacement. Now that Philbin is leaving his seat, producers are bringing back that practice. The first guest host to sit beside Kelly Ripa on Live! will be Jerry Seinfeld. Over the past twelve years, Seinfeld has only been marginally busy: starring in the animated Bee Movie, co-creating and co-hosting the short-lived The Marriage Ref, and making guest appearances on Curb Your Enthusiasm, among a couple of other projects. Although Seinfeld is only slated for a guest hosting gig, he’s certainly got the star power and the affability to take on a daytime talk show. Philbin’s last episode will be Nov. 18. Seinfeld will guest host from Monday, Nov. 21 to Wednesday, Nov. 23. –AOLtv

Person of Interest has been flourishing in terms of guest casting. First, we got Linda Cardellini. Then, Breaking Bad‘s David Costabile. And last week, character acting legend Dan Hedaya. The newest entree to this amazing lineup is Bridget Regan, star of Legend of the Seeker. Regan will play a Brooklynite hairdresser who finds her way into the lives of John Reese (Jim Caviezel), Mr. Finch (Michael Emerson), and their omnipotent machine. Person of Interest airs Thursday nights at 9 p.m. ET/PT on CBS. –TVLine