Credit: Jeffrey Ufberg/

To Jessica Simpson, fashion is only skin deep!

PETA is calling out the Price of Beauty star, 29, for wearing exotic skins. The animal rights organization is also criticizing fellow snake-skin lover Catherine Zeta Jones as well as Victoria Beckham, Sarah Jessica Parker, Lindsay Lohan and Paris Hilton for having scales in their ensembles.

In an effort to get A-listers to stop, Joaquin Phoenix is hosting a new PETA video -- one of his first video appearances in months -- on the skin trade that exists with such animals as alligators, lizards and snakes. (Watch the video here. Warning: the content is graphic and disturbing.)

"Did you know that mother snakes keep their eggs warm by wrapping their bodies around the eggs and then shivering to generate heat?" Phoenix, 35, says in the video short. "Exotic animals are mostly unknown to us, and so is what they suffer before being turned into belts and bags?"

Phoenix -- who had fans scratching their heads last year when he began making bizarre public appearances, claiming that he quit acting and was becoming a rapper -- isn't the only star PETA is thanking for his work for the ethical treatment of animals.