13. Renee Zellweger
Rennee had to gain weight for one of her most famed roles. The actresses gained about 20 pounds and went up 10 dress sizes to play Bridget Jones in Bridget Jones’s Diary. This was a breakout role for her, so she is probably glad that she took it and put on the pounds in hindsight.
However, the 20 pounds that she put on to play Bridget was not the amazing weight change. Well, 20 pounds isn’t really that impressive, is it? We’ve all gained that much during the holiday season at some point or another.
The amazing transformation occurred after the movie. Renee was able to get back to her size 4 dress size very quickly after the movie, but she didn’t stop after that. She continues to lose weight looked way too skinny at one point.
She has had her ups and downs since then, which can probably all be traced to the extreme weight loss that she underwent after making that movie.