The 61-year-old beauty has backed calls from Sir Roger Moore and The Mentalist star Owain Yeoman for chiefs at London's Fortnum & Mason to remove the controversial pate, made from the livers of ducks and geese, from the shop's shelves.
She has penned a letter to managing director Beverly Aspinall after watching shocking footage filmed by animal rights group People for the Ethical Treatment of Animals (PETA).
Twiggy's note states, "I find it shocking that Fortnum & Mason would sell the horribly cruel product of goose torture known as foie gras. A product so barbaric that its production is banned in the U.K. and in more than a dozen other countries.
"Anyone who has watched PETA's undercover footage of geese and ducks as they are force-fed several times a day via a pipe until their livers swell to many times their normal size cannot fail to be appalled. Foie gras has no place on British store shelves or menus, let alone in a shop that so blatantly trades on its British heritage... Please, please, remove this cruel product from your shelves."