I think I’m the only person in THE WORLD who saw the movie I Am Number Four. The sci-fi clunker was supposed to launch Hollywood hunk-du-jour Alex Pettyfer into the celebrity stratosphere but ended up killing his career instead. So terrible was the movie and so noxious was Pettyfer, that I worried his cute co-star Callan McAuliffe (left) would become collateral damage in the fallout. Not so. Callan’s career is doing just fine. In fact, he just touched down in his hometown of Sydney, Australia, where he’s prepping to play the young Jake Gatsby in the big Baz Lurman production. What do you think? He’s perfect, right? I mean, if we knew Leo DiCaprio only as he looks now, and never saw his glorious youth, this kid could totally pass for little Leo, huh?