Leonardo DiCaprio and Vittoria Ceretti Strip Down For St. Barts Beach Day

Leonardo DiCaprio and Vittoria Ceretti are letting the waters of St. Barts wash all the stress away … diving into the crystal clear ocean in barely any clothing.

The two lovebirds hit the beach Friday … Leo in a pair of black board shorts and Vittoria in a revealing two-piece bikini leaving little to the imagination.

Leo and Vittoria swam around together … engaging in some light PDA while treading water off the coast of the island country.

Lots of big smiles and laughs between the two … looking quite carefree as their holiday continues on.

The actor and the model have been together for a long time … first hooking up over the summer last year — and, they’ve been on a pretty constant vacation since it feels like.

They’ve been to Italy, France, London and New York City together … partying hard into the early morning hours, meeting each other’s families and a whole lot more couply stuff.

Unclear when their vacation will come to an end … though Leo’s got quite a few projects listed on his IMDb page — so, he’s got to get back to filming soon enough.