Mark Wahlberg is doing it BIG as he marks 10 years of marriage with his smoking hot soulmate ... vacationing on a picturesque Italian island with his model wife!!!

Mark and Rhea Durham are in the middle of an amazing family vacation in Sardinia ... living it up on a yacht, catching rays by the pool, and getting away from the kids at one point for a romantic stroll down the beach!

Check out their matching turquoise swimsuits ... Mark and Rhea are definitely #couplegoals.