Bikini day looks: Stars such as Kristin Cavallari and Melissa Gorga worked hard

National Bikini Day is a national holiday that fell on Wednesday. And stars worked hard to compete on Instagram for the big day, starting early in the morning and finishing after midnight.

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Bikini day looks: Stars such as Kristin Cavallari and Melissa

Bikini day looks: Stars such as Kristin Cavallari and Melissa

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