This week sets were buzzing with Hollywood A-listers all over the globe. In NYC, Ben Stiller got behind and in front of the camera to work on his project The Life and Times of Walter Mitty, and Rooney Mara continued filming The Bitter Pill. In Philadelphia, Colin Farrell scaled a building for Dead Man Down while across the pond, Nicole Kidman was in character for The Railway Man. Curious who else from Hollywood was filming this week? Click through to check out which other stars were hard at work on set.