Jason Alexander
The versatile actor, a.k.a. George Constanza on "Seinfeld," lost 30 pounds in 2010 on Jenny Craig after lugging around extra weight for years. "With every diet I ever tried, the first 10 pounds were always easy," he said at the time. "Then they would come right back. Jenny Craig's program is the first that helped me reach my goal." He also said, "I was fat. Now I'm thin." And: "When I turned 50 [in Sept. 2009], my teenage son asked me if I was going to be around when he turned 50 someday. That question helped me realize that if I didn't make significant changes, I might not be." Jenny Craig, by the way, no longer uses celebrity endorsers.
