These besties are CLOSE!

Hailey Baldwin and her pal Marianne Fonseca recently showed off their curves in bikinis while goofing around in a Turks and Caicos pool.

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"Meu bebê," the 19-year-old captioned a pic of the duo — which puts her pert derriere on display amidst the tropical background.

https://www.instagram.com/p/BMupzBEBhVt/

Even though the model turned off the comments on her Instagram posts, followers clearly love the snap, racking up 335,000 likes in one day.

Wanna see more from Hailey? Scroll through the gallery below for a look at her hottest social media shots!