Sadie, we knew ye when ye were a lady!

Sadie Frost is mooning the world, 'turning her back on fur' in the newest PETA porn ad campaign. The sometime actress and occasional 'fur-free' fashion designer exposed herself in a nude portrait launched in London's Covent Garden.

Frost, a strict vegetarian, teamed up with PETA to bare all for a new anti-fur ad photographed by rock legend and fellow vegetarian Bryan Adams. It was another in a continuing "Turn your back on fur" campaign that seems to be a thinly veiled effort to con young semi-celebs into posing naked.

Frosty hoped to turn a few heads (her mother? father? Mr. Adams?) with the ad and get some cheap press attention for PETA's tiresome anti-fur campaign.

Frost reportedly worked out a lot before the photo shoot to make her body look in the best shape possible; Six months of gluteus maximus exercises, for instance. The work outs were particularly important to her since the photo shoot went way beyond the usual soft core PETA porn displayed by the organization's other mental heavyweights such as Pamela Anderson. This time, PETA pervs are treated to a full gluteus maximus shot, the full (reverse) Monty as she showed Bryan Adams and the rest of the world's meat eaters her ass.