Kirstie Alley When the formerly svelte actress gained quite a few pounds post-"Cheers," she seemed like an ideal candidate to endorse Jenny Craig. All she had to do was tell women she got back her formerly fabulous figure thanks to Jenny. There was just one problem -- she couldn’t stop gaining weight. So unfortunately for Kirstie, she was replaced by Valerie Bertinelli, who was soon seen on TV fitting into her "skinny jeans" again.