The 90210 star marches on for a day of shooting on the show's L.A. lot. Plus: Nicole & Joel, Jennifer Aniston, the cast of Entourage and more

ROLE CALL!

Jennifer Aniston calls for attention Wednesday while filming a scene for her guest-starring role on NBC's 30 Rock in New York City. The former Friends star is brushing up her comedic chops to play a free-spirited Fatal Attraction-like stalker.