Gossip Girl stars Blake Lively and Leighton Meester have reportedly signed a deal to guest-star on TV show 30 Rock.

The actresses, who play spoiled students in their hit TV series, will feature in a Gossip Girl-inspired flashback sequence on 30 Rock during main character Liz Lemon's 20-year high school reunion, according to EW.com.

However fans of the program will be in for a shock as the sequence will reveal geeky Lemon, who is played by the sitcom's creator Tina Fey, was actually a bullying teenager.

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(This news article provided by World Entertainment News Network)