Kirstie Alley Sued For Allegedly Lying About How She Dumped Weight

Kirstie Alley is being sued for allegedly lying about how she dumped 100 lbs.

The suit, obtained by TMZ, was filed by a California woman who claims Organic Liaison -- the weight loss product Kirstie hocks online and on QVC -- is not the reason Kirstie dramatically slimmed down.

Plaintiff Marina Abramyan -- who used the product and filed the class action lawsuit -- alleges Kirstie shed the lbs by dancing her ass off on "Dancing with the Stars" and eating an extremely low-calorie diet.

As for Organic Liaison, Abramyan says it's bogus -- just a bunch of calcium and fiber which is not a proven weight-loss product.

Abramyan is suing for unspecified damages.

We contacted Kirstie's rep. So far, no comment.