Pamela Anderson joined animal rights campaigners in Paris, posing inside a cage to protest the caging of animals in European farming.
"I don't think any animal belongs in a cage for entertainment or for what we wear or what we eat," she told reporters.
"All of our choices are important and we have to be more conscious of our decisions," she added. "Animal welfare has come a long way, but we have a long way to go."
The organisers say they have the support of 140 organisations, including in France the Brigitte Bardot Foundation and PETA.
Anderson is currently taking part in the French edition of the television programme Dancing with the Stars.
(With inputs from agencies.)