Melissa Joan Hart jumps on the diet-plan bandwagon

Apr 2, 2013 at 6:21 p.m. ET

Melissa Joan Hart's weight loss secret goes by a name you'll probably recognize, The actress and mom of three boys is the latest celebrity to sign on to be the spokesperson for a big-name brand.

Melissa Joan Hart

Melissa Joan Hart is crediting her body-after-baby weight loss success to the diet gurus at Nutrisystem. Doesn't the actress, who welcomed her and husband Mark Wilkerson's third son last September look pretty great in this picture from March?

Revealing she's already 20 pounds down, Melissa Joan Hart shared in a statement to ET Online, "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."

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For their part in this joint effort, a Nutrisystem spokesperson said they're all "thrilled to be helping and working with Melissa" as she becomes the company's new brand ambassador.

"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," a statement from the weight loss brand continued.

Tweeting her excitement, the Melissa & Joey star shared Tuesday, "I'm losing weight&feeling gr8 w/ Nutrisystem already. It's perfect 4 me.I'm so excited 2 B part of the @Nutrisystem family! #bodyafterbaby."

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The 36-year-old mother of 7-year-old Mason, 5-year-old Brady and 7-month-old Tucker is in good company with other famous females who've taken a turn being Nutrisystem's spokesperson. Marie Osmond, Tori Spelling, Janet Jackson and more have all credited the program with helping them shed pounds.

Mariah Carey, on the other hand, signed on with Jenny Craig, while Jessica Simpson and Jennifer Hudson found success with Weight Watchers.

Does a celebrity endorsing a weight loss plan influence your likelihood to try it?

Image via WENN