All eyes were on Jennifer Aniston filmed a guest appearance as a crazed stalker for NBC’s hit show 30 Rock.
The former Friends star plays Claire Harper, who becomes obsessed with Alec Baldwin’s character Jack Donaghy.
Tina Fey - who plays Claire’s pal Liz Lemon and is also executive producer on the show - reveals that Jen has fitted in perfectly.
"Jennifer is not only incredibly lovely to have around, she also has what the young people would call 'mad skills," says Tina.
"We're very excited that she's joining us."
See Jen go all Fatal Attraction on co-star Alec below:




























