Sofia Coppola’s latest is about as interesting as the vapid microcosm in which it takes place: the small world of a bunch of half-wit Louboutin- and Vuitton-obsessed rich kids in L.A. They come up with the brilliant idea of finding out on the internet when this or that celebrity is out of town so they can sneak in the empty house and get their hands on the objects of their dreams. It’s mansion after mansion, gaudy and kitsch and