Pam Anderson is naked again. No, its not for Playboy. And no, its not a sex tape with an ex.

Its another ad for PETA.

Anderson is in her birthday suit in a shower in a "Psycho"-inspired shot along with the caption: "Meat and Dairy Farms Drain Half the Country's Water."

Referencing California's historic drought, the longtime vegan then urges people to become vegetarians (along with taking the state-mandated short showers).

Click here to subscribe to FOX411’s YouTube channel

More On This...

It is not Anderson's first time working with the animal rights organization. She has been photographed nude with butcher marks on her body, wearing a bikini made of lettuce leaves, and bottomless wearing a form-fitting t-shirt urging fans to "save the seals."

Anderson, 47, recently divorced Rick Salomon for the second time. The two issued a joint apology for how "harsh and cruel" the proceedings were.

Salomon is best known for starring in Paris Hilton's sex tape.

Four4Four: Stodden video canary in a sex tape coal mine?