Bear Grylls has drunk the fluid of fresh elephant dung, eaten live maggots as they squirted their guts onto the camera, paramotored above the summit of Everest and is partial to a bit of nude piano playing.

So is it any surprise that the man described as the "Real James Bond" proposed in an unorthodox, utterly random way?

Skinny dipping secret: Bear Grylls with wife, Shara. Credit:Getty Images

The 40-year-old has revealed that he proposed to wife Shara, naked, with a ring that he had hidden in his nether regions.

The couple had been skinny dipping, Grylls revealed to Piers Morgan this week, when he popped the question.