September 05, 2008 12:00 AM

Forget the Hamptons. Blair Waldorf and Serena van der Woodsen, or at least their alter egos, are heading to Rockefeller Center this November.

Blake Lively and Leighton Meester will guest star in an episode of NBC’s 30 Rock during November sweeps, according to EW‘s Michael Ausiello. The girls will play old classmates of Tina Fey‘s character Liz Lemon during flashback sequences.

The episode will be Lemon’s 20-year high school reunion, and it reveals a teenage Lemon was something of a Gossip Girl herself. Meester’s and Lively’s grown-up versions haven’t been cast yet, but producers are looking at Lively’s older sister Robyn as a possibility.

30 Rock seems to be on a roll with their slate of high-profile guest appearances this season. Jennifer Aniston has been filming her guest spot this week on the NBC hit, her return to the network since Friends ended in 2004. –Emmet SullivanSTEVE SANDS/NEW YORK NEWSWIRE; Michael Swarbrick/I

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