Scarlett Johansson in Max Mara on "David Letterman"

Someone’s definitely feeling like a movie star right now.     Scarlett Johansson at The Ed Sullivan Theater in New York City for an appearance on the “Late Show with David Letterman” in a MaxMara coat styled with Jimmy Choo sandals and Karen Walker sunglasses.   She tends toward retro ’40s-inspired looks and we’ve always …