Los Angeles - Prince Harry stripped down to nothing but the "crown jewels" while in Las Vegas on Friday 17 August, reports TMZ.
The gossip website revealed Prince Harry got naked during a game of strip billiards in his hotel suite.
Two photos have been published on the site. See the photos here.
The first sees a naked Prince Harry covering his groin with his hands as what appears to be a naked woman hides behind him.
In the second photo, the younger British prince is seen hugging a naked woman with his bare behind facing the camera.
According to the report, the Royal Family have decided to make no comment on the photos.
Prince Harry first visited Sin City in November 2011 while on a break from training on Apache helicopters in Arizona.
His antics on that trip were reported to be more demure and included renting a Harley Davidson, taking in a Cirque du Soleil show and staying at the Wynn Las Vegas resort.