Melissa Joan Hart and her husband Mark Wilkerson have had three babies in eight years. That's a lot of diapers — and body changes.

But the 37-year-old actress isn't letting mamahood interfere with having a great bod. Melissa lost 40 lbs. on the meal delivery weight loss program, Nutrisystem. What that calls for? Celebratory bathing suit pics! In February, Melissa showed off her bod in a blue one-piece and now she's stepping it up in a full on bikini.

"It's not everyday I like to show a lot of skin but these days I'm feeling confidant. Thanks Nutrisystem! Look for my new commercial that begins airing April 21! And don't miss me tomorrow on @GMA. You can ask me questions on twitter with #askMelissaGMA," Melissa wrote on Instagram, alongside a pic of herself wearing a coral bikini with a sun hat.

We're sure her hubby Mark and their sons, 8-year-old Mason, 6-year-old Brady, and 1-year-old Tucker, will be rooting Melissa on as she, ahem, explains it all about getting into shape. We know we will be!

Doesn't Melissa look great? Sound off in the comments.



Credit: NDN Photo: Melissa Joan Hart Flaunts Weight Loss (VIDEO)