Bethenny Frankel -- 'Skinnygirl' YANKED from Whole Foods

Bethenny Frankel's Skinnygirl cocktail line is under fire -- after the Whole Foods supermarket chain ripped the products from the shelves over a dispute about the ingredients.

According to the Huffington Post, the honchos at Whole Foods claimed they discovered the "natural" ingredients used in the cocktail line aren't natural at all -- and decided to stop selling any more Skinnygirl products.

We spoke to a Whole Foods employee in Michigan who told us products were briefly sold at his store -- but confirmed the line was pulled because "it was learned the ingredients are not natural."

TMZ has placed calls to the people behind Skinnygirl and the honchos at Whole Foods -- so far, no comment from either side.

10:47 AM: A spokesperson for Beam -- the company that owns the Skinnygirl line -- tells us Whole Foods never "pulled" the product, but simply decided not to reorder.

As for the ingredients, the rep tells us, "Skinnygirl Margarita contains very low levels of sodium benzoate (a preservative) so it can stay on the shelves."