Celebrity transformations happen all the time. We read about them in magazines and hear about them in advertisements. Whether it's a star losing a ton of weight or showing off a revamped wardrobe, we are no stranger to makeovers. And our favorite athletes are not immune to them either.

Our partners at Bleacher Report have shared the 20 best before and after pictures from top athletes. Some of these makeovers really improved the athlete's style; others were fairly mediocre.

If you feel like revamping your own look, check out Glee star Cory Monteith's style secrets.