Madison Keys and Serena Williams join 38 other talented women in TODAY's Style Heroes of 2017 list. The feature celebrates women who  "don’t need permission to be who they are and wear what they want."

Williams just penned a public letter to her mom about her struggles with body image, and how she has learned to embrace her strong muscles.

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Meanwhile, the 22-year-old Keys has been vocal about cyberbullying, and hosts Fearlessly Girl summits to help teach girls be kinder to themselves and others.