9. Natalie Portman
Just like her costar in “Black Swan,” Natalie Portman was forced to lose a large amount of weight from her already very petite and tiny frame. This caused her to look downright sick, almost like a patient in a hospital with a terminal disease who simply cannot control her weight anymore. Once the role was over, however, she ended up pregnant. When her baby was born, she lost her weight but she managed to stop the weight loss at the point she was before she was losing weight for her role, which is just perfect. She’s so tiny and petite as it is, being smaller is not a good look for her.