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The model, known for her flesh-flashing, risque style, showed up at Harper's Bazaar ICONS party in New York City on Friday in a gown that showed a lot of skin, to say the least.
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While many of Ratajkowski's fans praised the 25-year-old for her sexy look, Gunn couldn't help but speak out against it.
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Gunn said, "This dress is so appallingly vulgar and revealing. Why wear anything? Why not just take it all off,"
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Ratajkowski was not amused, tweeting: "Western men in 2016: Want to ban women abroad from voluntarily covering themselves at the beach...then want women to cover up their 'vulgar' bodies at home."
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