Liev Schreiber and Naomi Watts out for a walk downtown ... Gwen Stefani arriving at JFK ... Brooke Shields and husband Chris Henchy apartment hunting in SoHo ... Shia LaBeouf running on Madison Avenue ... Hilary Duff shooting scenes for The Business of Falling In Love ... Dwayne "The Rock" Johnson arriving at his hotel ... Zach Braff walking his dog ... Gerard Butler leaving MTV studios in Times Square ... Samuel L. Jackson filming scenes for The Other Guys ... Will Ferrell on the set of the same movie with his wife and kids ... Lindsay Lohan standing outside Gemma on the Bowery ... and Sienna Miller walking her dog.