Melissa Joan Hart welcomed her third child with husband Mark Wilkerson in September. But just because it's all too familiar territory doesn't mean dropping the baby weight is any easier. So the Melissa and Joey star turned to Nutrisystem, and she's already lost 20 pounds! The actress showed off her svelte shape at the premiere of The Incredible Burt Wonderstone. And on Tuesday the 36-year-old broke the big news that she's now the program's newest brand ambassador, saying 'I'm losing weight and feeling great with Nutrisystem already. It's perfect for me.'.