Pictures of Jennifer Aniston, John Hamm, Angelina Jolie, Kristen Stewart, and Taylor Lautner on the Set

It was a busy week for some of Hollywood's biggest names on the set! Jon Hamm took a trip back in time on the set of Mad Men while Jennifer Aniston splashed around in Hawaii working on Just Go With It. Angelina Jolie was still working hard in Venice, and Kristen Stewart and Taylor Lautner were back in action on the Vancouver set of Eclipse. Click through to see all the stars on set this week!