Kardashian caused uproar earlier this week after stepping out in Paris wearing Christian Louboutin footwear made from the snake, prompting the animal rights group to compare her to Cruella de Vil.
"They'd go well with a Dalmatian-fur coat, which is also illegal to sell in California and immoral to sell anywhere else," a PETA spokesperson said.
However, Gerrard has since come out in support of the reality TV star's unethical fashion choice, writing in her OK column: "Lots of people were laying into Kim Kardashian for wearing these snakeskin boots in Paris, but I thought she looked gorgeous."
In response to the WAG's comments, a PETA representative told Digital Spy: "Alex Gerrard must not realise that animals pay a high price for every bag, belt and shoe made from exotic skins.
"PETA has sent her a hard-to-stomach video exposé of the exotic-skins trade narrated by Hollywood star and ethical vegan Joaquin Phoenix, and we have to believe that once she's seen it, she'll agree that there's nothing 'gorgeous' about nailing snakes to trees by their heads and then peeling their skin off their bodies while they are still alive."
PETA has also condemned Kardashian for her decision to wear fur, running an advert last year showing her face above a group of baby foxes with the slogan: "Kim, these babies miss their mother. Is she on your back?"