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Kristin Cavallari, 37, bares her washboard abs in black string bikini with boyfriend Mark Estes, 24, as they wrap up their Greek holiday

Kristin Cavallari ended her trip to Greece on a high note. She bared her washboard abs in a black bikini as she posed alongside hunky boyfriend Mark Este in Instagram photos.

Kristin Cavallari ended her trip to Greece on a high note as she shared the final photos from the vacation on Instagram this week The 37-year-old reality star bared her washboard abs in a black bikini as she posed alongside hunky boyfriend Mark Estes, 24 Anderson, who often appeared on the jewelry designer's reality show Very Cavallari, also recently shared an Instagram post with photos from the scenic vacation.

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