Julia Roberts' brother Eric has reportedly signed up to Bear Grylls' 'Celebrity Island'.

Eric Roberts

Eric Roberts

The 62-year-old actor has agreed to spend four weeks in the wild, with nothing but the clothes on his back and a handful of basic survival tools, in a bid to raise money for Channel 4's Stand Up to Cancer campaign, according to The Sun newspaper.

The 'Dark Knight' star will be taking part in the challenge alongside The Rolling Stones' guitarist Ronnie Wood's ex-wife Jo Wood and Roxanne Pallett as they attempt to catch and kill their own food, build their own shelter and travel around the island without being stalked by fellow angry animal residents.

A source said: "'The Island' makes other reality shows look like a walk in the park.

"Jo and Roxanne are looking forward to the challenge but are secretly dreading it.

"Roxanne in particular loves her creature comforts - but you can't even take a toothbrush onto Bear's show."

Last year's celebrity special saw the likes of Lucy Mecklenburgh, Ryan Thomas and Iwan Thomas battle through to survive the four weeks on the island, while their camp mates Sharron Davies, RJ Mitte, Jordan Stephens and Mark Watson all walked.

Despite the harsh conditions and lack of food leading the tempers flying, a romance blossomed between Lucy and Ryan - and the couple are still together now.

In 2016, Made in Chelsea's Ollie Locke came under fire after he stabbed a crocodile to death because him and his camp mates were so desperate for food.

Ollie's former 'MIC' cast mate Lucy Watson - who is an animal activist and long-time vegan - tweeted at the time: "I think there are better ways of raising money for charity than killing a caiman for entertainment. Especially when you can afford food."

Channel 4 released a statement stating that "those on the island received training on how to kill animals humanely and this was utilised properly in each instance."

'Bear Grylls' Celebrity Island' is set to return to screens in the autumn on Channel 4.