Jennifer Hudson | Winnie | Lost: 80 lbs

Ever since Jennifer Hudson won the 2004 American Idol, she has become a global superstar and has received numerous accolades, including a Golden Globe Award, an Academy Award, and two Grammy Awards. She was also listed by Time as one of the 100 most influential people in the world. After she gave birth to her son in August 2009, she had to lose her post-pregnancy baby weight for her next credit role as Winnie Mandela in the 2011 drama film Winnie Mandela.

She went about her weight loss by keeping a healthy lifestyle and by working out with her personal trainer, Harley Pasternak. Through her trainer, she learned a lot about portion control. Hudson wanted to make sure she was physically fit before filming for the new movie began. And, to be sure, she seems to be ready, given the amount of weight she was able to lose.