From Bella Swan to sex kitten! This is Kristen Stewart as we've never seen her before, shot by Mert & Marcus for W.

Ah, the September issues. They weigh a ton, have more ad pages than editorials and pull out all the stops when it comes to big-time celebrity cover stars. This year wasn't different from any other year in the celeb department -- pop stars, Hollywood screen sirens and (of course) SJP all made appearances on the covers of fashion glossies in the United States and beyond. While it's not often that a huge star looks bad, some of said covers are much better than others, and so we've rounded up our favorite September 2011 issues that feature someone super famous. Click through for our picks!