It’ll be a star-studded season of guest appearances on 30 Rock this Fall. Jennifer Aniston is already shooting a guest spot on the hit NBC series; and the Queen of Talk herself, Oprah Winfrey, up for a cameo on the show. Now Gossip Girl frenemies Leighton Meester and Blake Lively are aboard to share the screen with Emmy-nominated funny lady Tina Fey on an episode of 30 Rock this November.

Former Blake and Leighton, who play “Serena” and “Blair,” respectively, on The CW series Gossip Girl, will play a pair of high school classmates of Liz Lemon’s in a flashback sequence, according to an inside scoop from Entertainment Weekly.

Gossip Girl’s Blake Lively made her debut appearance on the Late Show with David Letterman on Thursday. Here is a video from the actress’ appearance.

According to the New York Daily News, actress Blake Lively reportedly begged a photographer to delete a shot of her picking her teeth at a Gossip Girl bash in the Hamptons this weekend.

Gossip Girl stars Blake Lively and Leighton Meester, furious foes on and off the small screen, were spotted filming a fight scene, complete with hair-pulling and shoving, for the upcoming second season of the smash CW series.

Gossip Girl star Blake Lively makes her Cosmo debut on the September 2008 issue of the women’s mag.

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