David Duchovny walking his dog on the Upper East Side this morning ... Ashlee Simpson leaving her apartment on Saturday ... Brad Pitt and Angelina Jolie taking Maddox, Pax, Zahara and Shiloh to see Mary Poppins on Broadway ... Matthew Broderick walking in the West Village ... Catherine Zeta-Jones leaving her apartment on Central Park West with her dog ... Angela Lansbury sitting in a car outside the Walter Kerr Theatre ... Pete Wentz walking by himself ... and Conan O'Brien shopping with wife, Liza, on Madison Avenue.