July 5 marks National Bikini Day in USA.
Scroll down to take a look at how some of the models celebrated the day.
It's a retro look from Hailey Baldwin. Photograph: Courtesy Hailey Baldwin/Instagram
Martha Hunt uploaded this pic. Photograph: Courtesy Martha Hunt/Instagram
Martha Hunt also posted a pic of her chilling in the pool. Photograph: Courtesy Martha Hunt/Instagram
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This model's health is none of your business!
Have you met the new curvy Gigi Hadid?
27 years later, this model still fits into vintage bikini