Playboy model Joanna Krupa has once again bared all – this time for PETA Christmas pet store campaign.The Polish beauty will strip in an effort to make animal lovers think twice before buying a puppy from a pet store. She will appear as a winged angel, covered by a carefully-placed crucifix, in the new billboard."We're trying to spread the word that breeding isn't the way to go. Somebody needs to put their foot down and stop this breeding and these puppy mills... It makes me so angry that our government doesn't do anything about it. So I am!" Contactmusic quoted her as saying.Cover girl of Playboy magazine’s December issue, Krupa defended women who drop their clothes for the magazine, insisting that the act empowers them.