Photo shoots of movie stars often expose unexpected duplicity. Why, for example, would someone who lets all pores and wrinkles on the face of the character he plays be illuminated on a giant screen, yet not allow  a still camera to shoot a certain side of his face? I don't get it. Of course, some of the actors we photograph are very easy going. I once attended a shoot with Julia Roberts where she spent hours doing different set-ups for the photographer - one involving lying on a bed. It meant that she missed meeting friends for dinner, but still she was playful for the camera. (She later told me she hit some clubs with her friends afterwards because she was in full hair and makeup and she didn't want to waste it.) Helen Mirren was a total pro, arriving on time, telling everyone in the room "let's have some fun,"  and allowing a whole pie to be thrown at her.  Last night, at our exclusive L.A. shoot of Robert De Niro and Al Pacino, whose movie Righteous Kill opens in September, there was no pie-throwing. There was barely talking. The two great American actors - who have made The Godfather and Heat but barely shared a scene until now - seemed preoccupied, our shoot supervisor Jennifer Dorn tells  me. At one point she wanted to say, "Come on guys, be a little more present." The actors arrived separately — though they were making the movie at a nearby soundstage — spoke very little, even to each other, and certainly didn't josh or wise-crack with the crowd, like George Clooney and Brad Pitt would. And believe me, there was a crowd. A shoot like this comes with scores of people - stylists, assistants, publicists, assistants, hair-dressers, make-up artists, caterers, more assistants.  Double it for two. Nevertheless, these accomplished, iconic, 60-something men got the job done, and we're looking forward to showing you the results come September. Meanwhile, check out the Righteous Kill trailer below.