Prince Harry put the crown jewels on display in Vegas this weekend ... getting NAKED during a game of strip pool with a room full of friends in his VIP suite. Once in the room, things got WILD ... with the group playing a game of strip pool that quickly escalated into full-on royal nudity. Some of the partiers snapped photos of the madness. In one photo, a fully nude Harry cups his genitals while a seemingly topless woman stands behind him. In another photo, a naked Harry is bear-hugging a woman who appears to be completely naked as well.