In the Sony hack in 2014, leaked emails publicly put a spotlight on the wage gap between male and female movie stars.

Actress Jennifer Lawrence had no idea that she was making less than her male co-stars in "American Hustle" until that information was leaked. She was, understandably, pretty ticked off.

Co-star Bradley Cooper was also upset. As a result, he said he would start revealing his salary information to female co-stars to help with their contract negotiations.

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