Melissa Joan Hart Reveals 40-Pound Weight Loss After Giving Birth to Third Son: Transformation Video

Was it magic? Not quite! Melissa Joan Hart, who's dropped a whopping 40 pounds since giving birth to her third kid, son Tucker, back in 2012, revealed her admirable weight loss while shooting a commercial for Nutrisystem.

The mother of three sons — Mason, 8, Braydon, 5, and Tucker, 17 months — who gained 60 pounds during her third pregnancy, shows off her tinier, toned frame in a form-fitting cobalt swimsuit. "I was so sick of things not fitting properly," the 37-year–old confessed to Us Weekly back in December.

Since going on Nutrisystem in Feburary 2013, the Sabrina the Teenage Witch alum told Us she has "lost three jean sizes, and all my baby weight and then some." With no specific goals in mind, Hart simply wanted to approach her weight loss with a healthy mindset. "I just wanted to put something on and be like, 'okay, good,'" she confessed. "I have been able to forgo the Spanx…and its been really nice," she joked.

Melissa Joan Hart

There was, however, one additional motive for the star to shed pounds: Hart wanted to look good for her husband, rocker Mark Wilkerson. "He does it for me, that's why I have to return the favor," she told ET. "He is the guy who is disciplined… His whole thing is 'stick to it, be healthy, be fit.'"

In addition to using Nutrisystem, Hart added that she maintains an active lifestyle by frequently spinning and going on hikes. "For me, it was important to bond with my child, as opposed to lose the weight," she told ET. "In the beginning, I felt an uncomfortable pressure that I rebelled against." The actress overcame her initial struggle because she "wanted to look great."

"I have to look fantastic going into my 40s," Hart quipped. Watch the video now!

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