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>In preparation for her role Kristen Stewart learned how to pole dance, deprived herself of sleep, chain-smoked, and ate mostly junk food. As a result Stewart's body and legs were covered with bruises, her skin was blemished, and she constantly looked tired. Director Jake Scott praised Stewart's dedication because she was so willing to allow herself to subordinate her physical appearance for the role.

http://www.imdb.com/title/tt1183923/trivia?item=tr1618931

Who are some actresses who have done similar things to prepare for a role?