Recent Edit: After really scrutinizing this picture, I noticed two more things:
a. Edward is carrying something (a rock? A piece of chocolate cake?)
b. I can just barely make out what looks like someone running behind the big mossy tree (Jasper? Emmett?)
I'm thinking this was taken somewhere around the ballet studio scene (because of Edward's outfit), the baseball scene (because of Rosalie's striped socks, someone pointed out), and the scene with Bella, Edward, and the other Cullens in the garage with all the cars (where Edward is just in his grey shirt - he must have shed the vest).
Go on and click the photo to make it a bit bigger for your own close inspection.
Credit: Yahoo! Movies and Summit Entertainment