Melissa Joan Hart has been chosen to be the next spokesperson for the dieting product 'Nutrisystem.' Melissa Joan Hart revealed via Nutrisystem that she had already lost 20 pounds on the diet plan since giving birth to her third child in September 2012.

Nutrisystem released a statement saying it was "thrilled to be helping and working with Melissa" as she becomes the new brand ambassador for the company.

"She mirrors our values and will resonate with our customers as authentic. Moving forward, you'll see us have an appropriate mix of inspiring celebrities and real life customers who have also enjoyed success," the statement continued.

36-year-old Melissa Joan Hart said she can't wait to share her weight loss success with others. She said, "I love working with Nutrisystem. The program is really delivering results for me and I look forward to long term success, staying motivated and helping others do the same."

Hart has three sons with her husband, Mark Wilkerson. She is best known for her roles on the family-friendly TV shows Clarissa Explains It All and Sabrina, the Teenage Witch.

Currently, Hart stars in the ABC Family comedy Melissa & Joey with Joey Lawrence. Melissa Joan Hart will soon release a memoir titled "Melissa Explains It All."

Nutrisystem tweeted a welcome to Melissa Joan Hart, writing, "We are thrilled to announce @MelissaJoanHart as our newest brand ambassador!"