Jennifer Aniston's Stalker Role

Hard at work on the set, Jennifer Aniston kept busy shooting scenes for her guest role on NBC’s "30 Rock" in New York City on Wednesday night (September 3).

According to press reports, Miss Aniston is taking on the role of Claire Harper, the former roommate of Liz Lemon who ends up stalking Jack Donaghy.

Of having the former "Friends" star on the show, "30 Rock" actress Tina Fey (who plays Liz Lemon) told press: "Jennifer is not only incredibly lovely to have around, she also has what the young people would call 'mad skills. We're very excited that she's joining us."

And while the actual episode in which Jen will appear is still unknown, insiders believe it will either be the first or second episode of the season. "30 Rock" returns to the air with its third season premiere on October 30th 9:30 PM on NBC.

Gossip Girls

Enjoy the pictures of Jennifer Ainston on the set of "30 Rock" (September 3).