Kylie Jenner Bikini Pics -- Legally Hot in Mexico (PHOTOS)

Kylie Jenner left the country after celebrating her 18th birthday to frolic on the beach in Mexico with her pal Pia Mia at Joe Francis' luxury beachfront resort in Punta Mita.

These shots reveal a whole lot of her Jenner-Karadashian assets -- and are way less creepy today than they were last week. Don't worry ... Pia's also 18.