Pamela Anderson has stripped down for Playboy magazine for a good cause – the actress has donated her $25,000 modelling fee to charity.

The former Playmate and Baywatch star posed nude for the January, 2011 issue, and had the cheque sent directly to Waves 4 Water, a charity that distributes filters to people who don’t have access to clean drinking water.

The actress tells TMZ.com: “Waves 4 water are my heroes. They get things done… and yes, Playboy wrote them a check when I shot the cover directly for 25Gs.

“I’ve also donated personally. I wish I could do more. Indonesia, Haiti and Pakistan are all in need of these filters. Spread the word!”