Which Celeb Had The Biggest Weight Loss Transformation?

We all fell in love with funny lady Melissa McCarthy after her breakthrough roles in Bridesmaids and Tammy. She's always been positive about her body, but as she's gotten older she's shed some pounds in order to protect her health. Melissa credits her massive 75-pound weight loss with making a few simple changes for a healthier life - she now makes sure to go to bed early and get enough sleep! She also exercises regularly. Seems obvious, but these small changes really made a difference!

Zach Galifianakis is everyone's favorite funny man, oftentimes playing awkward, quirky, and zany characters in films like The Hangover and Dinner For Schmucks. But after making it big on the silver screen, Zach's body has undergone its very own Hollywood transformation. In the last few years, Zach has dropped an estimated fifty pounds of fat! Zach credits his amazing transformation with a few simple changes - he cut out alcohol completely from his life and started walking more often.

Jennifer Hudson first captured our hearts when she competed on American Idol season 3 in 2007. Despite placing seventh in the singing competition, she still rose to fame, and by the age of 30 had won the Golden Trinity - a Golden Globe, Grammy, and Academy Award were all under her belt. She put her efforts next on losing weight, dropping 80 pounds using Weight Watchers. Her real-life success story of using the program meant that she was the perfect spokeswoman for Weight Watchers.

Renee Zellweger is a serious actress, and she's not afraid to drastically alter her body in order to perfectly embody a character. For the movies in the Bridget Jones' Diary trilogy, Renee committed to the part of the British journalist who struggled with her weight by putting on approximately 20 pounds. She followed that up with toning up and dropping the pounds again for her lead role in 2003's Chicago. But whatever her weight may be, she always looks gorgeous!