The billboard features Patridge dressed as a sexy angel with wings. She's holding her adopted dog.
The billboard includes the messages, "Be an Angel for Animals -- Always Adopt, Never Buy" and "Buying Animals Means Killing Animals."
"I wanted to get involved with PETA because I've always been passionate about animals, and I think this is a great way to make people and all my fans aware of all the animals that need a home," said Audrina on PETA's website. "And a lot of people go to pet stores and breeders to buy their animals, but you should adopt, so go to an animal shelter and rescue a dog."
It may be a good time to adopt a pet, as the California legislature is considering a bill that would allow tax deductions for animals adopted from local government and non-profit animal shelters.