When it comes to struggling with weight and counting calories to be in prime body shape, celebrities are just like the rest of us. Given the demands of the entertainment industry to stay fit in order to keep up the stardom, it often is seen that celebrities take up every possible measure, from lifestyle changes, extreme diet regimens to surgical corrections, to appear in peak shape. While there are celebrities such as Dwayne "The Rock" Johnson, Henry Cavill and Ryan Reynolds who've committed themselves to healthy lifestyles throughout their careers, many Hollywood A-listers have chosen different ways to shed or gain a few pounds, before taking up a movie role. Nevertheless, we have some pretty jaw-dropping body transformations that both shocking and awe-inspiring. Here we take a look at 13 Hollywood actors and A-listers whose weight transformation is sure to drop your jaw!