Pictures of Sarah Jessica Parker, Jon Hamm, Mark Wahlberg, and Tina Fey on Set

Hollywood was busy this week, as several celebrities were hard at work on their latest projects. Sarah Jessica Parker continued to film I Don't Know How She Does It alongside Jessica Szohr in New York, while Szohr's Gossip Girl costar Leighton Meester tried to keep warm on the set of the CW show. Meanwhile, Jon Hamm and Megan Fox left the city for the slopes, shooting ski scenes for their movie Friends With Kids. See all of this week's stars on the set!