Audrina Patridge has stripped off to save the animals.

The Hills star - and apparent owner of a brand new face - appears in her undies in the latest advert for animal charity PETA.

Dressed as a sexy angel, the reality TV starlet urges fans to 'Always Adopt, Never buy' cats and dogs.

Audrina was all smiles as she stepped out to launch the billboard on Beverly Boulevard yesterday.

See other stars that have stripped off for charity