Zach Wilson will soon step off the gridiron and into a stylish tux ... 'cause he just got engaged to his model girlfriend on an Italian vacation.
Nicolette Dellanno -- the lucky lady ready to settle down with ZW -- posted pics of the two together overlooking the water on an Italian cliffside just moments ago ... and check out the pics 'cause she's got a MASSIVE rock on her left hand.
Dellanno's clad in all white here -- looking pretty dang angelic, we gotta say .