Kylie Jenner 's BFF Antastasia "Stassie" Karanikolaou dropped jaws with new photos while flaunting her assets in a teeny-tiny string bikini.

On Aug. 12, the model, 28, took to Instagram with a carousel of snaps that immediately turned heads.

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"Really running out of pages on my passport," she captioned the update.

For the featured image, Karanikolaou rocked a black bikini while sitting on a rock that was mostly submerged in water. She leaned back seductively with her eyes closed and her wet hair cascading down her back.

Further into the carousel, Karanikolaou donned the same two-piece swimsuit while wading in shallow water during her vacation.

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