The Twilight star has agreed to help raise the profile of the GO Campaign, which was set up in 2006 to help vulnerable children by providing essential resources including accommodation, clean water and education.

"I've eagerly followed the growing impact GO Campaign has had over the years, on so many children and youth, and I love how tangible and transparent it is," Robert says. "They partner with some remarkable grassroots local heroes who are doing fantastic work but who lack the needed resources, and in places where a little bit of money can go a long way.

"I've been a donor and a supporter, and now I look forward to joining their efforts, so together we can give opportunity to even more kids and young adults across the globe."

The organisation's founder and chief executive Scott Fifer confirmed the actor put himself forward for the ambassador job after years of supporting their cause by attending events and donating items for auctions.

Robert is set to appear at the charity's annual gala, hosted by Ewan McGregor, on 12 November (15) in Beverly Hills, California.