Renée Zellweger
Renée Zellweger is best known for playing the lovable Bridget Jones in the movie franchise, but she also had to go through some extreme transformations for the role. She gained and lost weight several times to play the character, who struggles with her body image and love life. She said she ate 4,000 calories a day to pack on the pounds and then followed a strict diet and exercise regimen to shed them off. She also sparked a lot of controversy when she appeared with a different face in 2014, but she said her appearance changed due to aging and stress.
