Nick Young & Iggy Azalea -- Bikinis, Yachts & Jean Shorts

Los Angeles Lakers star Nick Young and his rap star GF Iggy Azalea ran for the border to celebrate their birthdays ... and they documented every bikini-clad, yacht-riding moment.

The two haven't revealed exactly where they are -- but due to the fact Swaggy was rockin' a poncho and casually dropped the word "Hombre" in an Instagram post ... it seems like their somewhere south of L.A.

One thing we do know ... they're having a blast -- they've posted pics of Iggy showing off her ass, Nick showing off his new Panama hat (plus ripped jean shorts btw) and the incredible resort they're staying at that overlooks the ocean.