E! reality star Kim Kardashian of "Keeping Up With the Kardashians" has been sued by Dr. Sanford Siegal, creator of the Cookie Diet, for defamation for tweeting that she was down on the diet, reports MediaPost. In a suit filed in Florida last week, Dr. Siegal claimed that Kardashian was a paid endorsee for his cookie diet at the time she wrote on Twitter that she was not in favor of the plan. She allegedly tweeted, "Not true! I would never do this unhealthy diet! I do QuickTrim!" Kardashian reportedly earns $10,000 per tweet as an endorser.