Shane and Sia Barbi may be famous for their legendary Playboy magazine covers, but their heart and passion is focused on the fair treatment of animals.

The animal activists are getting attention with their new controversial movie poster for the documentary "Earthlings," that takes a look at factory farms and their cruelty towards animals for meat.
Shane and Sia are the U.S. spokeswomen for the film, which is set for international release and worldwide DVD distribution this August.
The Barbi Twins have always had a passion for animals and were recently featured in the documentary "Skin Trade," that exposed the exploitation of animals for their fur. They also launched the animal activism site TwinBunnies.com and donate all proceeds from their book "The Eco Anti-Diet" to charities for animals.