It's definitely the trend to have guest stars on your show this season. Everyone's doing it. And NBC is even inviting CW stars over to their network.
America's favorite Gossip Girls Blake Lively and Leighton Meester will be appearing on an episode on 30 Rock this Fall. EW.com reports that the girls will be featured in a GG-inspired flashback sequence during Liz's 20-year high school reunion.
30 Rock fans will be surprised to discover that dorky Liz was quite the bitch back in the day.