Looking back on 2012, there's no question that there was plenty of extreme celeb behavior -- and weight losses to boot. Just look at Anne Hathaway and Matthew McConaughey, who managed to prove that dropping major pounds -- even in the name of art -- isn't always something to be lauded on the cover of a celebrity weekly ...

Other times, it's totally aspirational! And thankfully, over the past year, plenty of stars have earned props by slimming down for themselves in a healthy way -- by working out and eating right. Here, six of the most inspiring celebrity fitness transformations of 2012. Check 'em out ...

Image via UsMagazine.com