The 22-year-old, who is the daughter of actors Bruce Willis and Demi Moore, wrote her essay on (Warning: Link contains nude images) XOJane.com and acknowledged her famous last name.
"What began as a challenge to Instagram and its prejudiced community guidelines became an opportunity for dialogue," Willis wrote. "Matters like the taboo of the nipple in the 21st century, public breastfeeding, slut shaming, fat shaming, breast cancer awareness, body positivity, gender inequality, and censorship have found their way into mainstream discussion."
She added, "But unfortunately the emphasis in the press has been on sensationalizing my breasts, chiefly in terms of my family."
Willis goes on to point out that what she did last week has been done for years by other groups, like the Free The Nipple campaign.
Willis explained earlier in the essay that the whole thing began after her Instagram account was reportedly deactivated because she posted a photo of herself in a sheer top and another photo of a sweatshirt which featured a photo of two of Willis' friends topless on it with their faces cropped out.
On May 27, Willis walked around topless in New York City and documented it on Twitter to raise awareness about the issue. One (Warning: Link contains nudity) tweet reads "Legal in NYC but not on @instagram."
"I am not trying to argue for mandatory toplessness, or even bralessness," Willis (Warning: Link contains nudity) wrote in her essay. "What I am arguing for is a woman's right to choose how she represents her body -- and to make that choice based on personal desire and not a fear of how people will react to her or how society will judge her. No woman should be made to feel ashamed of her body."