Don't be mad if Robert Griffin III does R-G-3 takes when looking at his wife this week ... the two are currently in the tropics on vacation -- and her body's STUNNING.
Check out some pics Grete Griffin shared on her Instagram page on Friday morning ... the mother of three looks amazing.
In a tiny black bikini, Grete put her abs on full display, showing no matter what the angle is -- whether it's in the sand, soaked in ocean water, or on a boat -- she's as hot as ever.