Steve-O, Joanna Krupa, Roselyn Sanchez Naked for PETA

You don't need to be Monica Leigh to take your clothes off.

While that Playboy Playmate does it for cash and fame, other celebrities bare it all in the name of animal protection. We've documented how Holly Madison and Alicia Silverstone have donned birthday suits in ads sponsored by PETA.

The latest to join those beauties? Former Jackass star Steve-O. We know you'd rather see Trishelle Cannatella naked - his co-star in the new stupid reality show, Dr. Steve-O - but you're stuck with this image for now. Blame PETA.

To help cleanse your eyes, at least, here are past ads for the animal rights organization. These star celebrities slightly more attractive than the jackass above: Joanna Krupa and Roselyn Sanchez.