Ryan Seacrest preparing to board a helicopter at the Chelsea heliport ... Michael Lohan catching a flight at LaGuardia ... Mario Cantone walking through the Village ... Aubrey O'Day and Ashley Parker Angel signing autographs outside their Broadway show ... Rufus Wainwright walking near Lincoln Center ... Mary Louise Parker walking with her kids downtown ... Tom Cruise and Katie Holmes heading inside Lincoln Center to catch a show ... Ethan Hawke shopping in SoHo with his daughter ... Jon Stewart caught in a traffic jam in the Flatiron district ... and John Mayer en route to the airport.