Miranda Kerr poses as a naked tree-hugger for the Australian edition of Rolling Stone.

Orlanda Bloom's model girlfriend appears naked and chained to a tree on the cover of the magazine's first 'Green Issue.'

The Aussie beauty agreed to pose in the buff for to raise awareness of environmental issues, specifically the fate of her native country's Koala bears.

She tells the magazine: "It's a sad thing - there are only about 100,000 Koalas left in Australia.

"Something like 80 per cent of the koalas' habitat has been destroyed since Europeans arrived in Australia.''

Whilst Miranda is used to posing for the cameras wearing very little as a Victoria's Secret lingerie model, this is her first nude photoshoot.

See other star's who have bared all for a cause below