FORT WASHINGTON, Pa., April 2, 2013 /PRNewswire/ -- Nutrisystem, Inc. (NASDAQ: NTRI), a leader in weight loss with over 40 years of proven effectiveness, has signed a new female celebrity spokesperson and has been named the "Best Convenience" diet by USA TODAY. The Company also revealed that in addition to " Super Monday" (the day after the final football game of the season), " Easter Monday" is one of the biggest diet decision days of the year. (Photo: http://photos.prnewswire.com/prnh/20130402/NE86997) Melissa Joan Hart Named New Nutrisystem Brand Ambassador Nutrisystem announced today Melissa Joan Hart, 36, actress, writer, producer, director, singer and mother of three, as its newest brand ambassador. Having recently given birth to her third child, the longtime actress has already lost twenty pounds on Nutrisystem. Hart is best known for her title roles in the television series Clarissa Explains It All (1991–94), the live action version of Sabrina, the Teenage Witch (1996–2003) and is currently starring in the ABC Family comedy series Melissa & Joey (2010–present). "We are thrilled to be helping and working with Melissa," commented Keira Krausz, Nutrisystem's Chief Marketing Officer. "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. We think dieters are savvier than ever and really appreciate someone who -- above all else -- is relatable." "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," remarked Ms. Hart. " Easter Monday" One of the Biggest Diet Start Dates The Company also revealed that the Monday following Easter has historically been one of the biggest diet decision days of the year based on a 25% spike in phone and web inquiries from consumers versus the Monday prior. According to proprietary Company data, as Americans turn their focus to warmer weather and vacations, the demand for healthy weight loss solutions rises.