For female stars, shoes are often a big part of any red carpet moment (case in point: Reese Witherspoon's neon Louboutins from last night). As for male stars? Not so much. One of the consistent exceptions to this rule, however, is Robert Downey Jr., a man who evidently loves his shoes. "He has a bigger shoe collection than I do!" Scarlett Johansson told Kelly Osbourne at last night's MTV Movie Awards red carpet. The news apparently didn't surprise Kelly, who explained that it was actually…