Scarlett Johansson wore Giambattista Valli last night for a visit to the Late Show in NYC. She chatted with host David Letterman about her new movie, Hitchcock, which opens in the US on Friday. Her costar Jessica Biel was on the Late Show, too, this week, but left the Big Apple in order to attend yesterday's LA screening. Scarlett, who's reportedly newly dating French journalist Romain Dauriac, pretaped a chat with Dave that actually airs tonight. This is a big week for Scarlett, and not just because she has a film coming out. Scarlett's birthday is tomorrow, on Thanksgiving — she'll be 28!