Lively and Meester will appear in an episode set to air in early November, claims a source. The plot will involve Tina Fey's character having a flashback to her high-school days after she gets stuck in a snow storm on the way to her 20-year reunion.

The two Gossip girls will appear as fellow students who were harshed upon by Tina.

That story line sounds like more fun than the actual reason why Oprah Winfrey might do a stint on 30 Rock.