See Melissa Joan Hart After 40-Pound Weight Loss

Melissa Joan Hart, seen left at the SiriusXM Studio on May 30, 2012, and at right, at The 40th Annual Peoples Choice Awards at Nokia Theatre LA Live on January 8, 2014.
PlayCindy Ord|Steve Granitz/Getty Images
WATCH Lightning Round With Melissa Joan Hart

Wow! Melissa Joan Hart has lost 40 pounds since giving birth to her son Tucker in late 2012.

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The "Melissa & Joey" star, 37, said she feels "pretty amazing" and revealed her slimmer self to "Entertainment Tonight", which was on set to watch her film a commercial for Nutrisystem.

"I felt prepared. I was confident," she told ET of posing in a one-piece blue swimsuit. "I don't wear bikinis even when I go to the beach, so when I put it on in front of the cameras and all these people, and my husband showed up -- it's nerve-wracking but the feeling is very satisfying."

Joan Hart said she gained 60 pounds during her third pregnancy. She took her time shedding the weight.

"For me, it was important to bond with my child, as opposed to 'lose the weight.' So I waited until I was ready, and I knew I had the time, and then I made it a priority that I would eat well," she said.

Read: Melissa Joan Hart Reveals Drug Use, Same-Sex Hookup in New Memoir

Now, the actress said she is happier than ever with her figure.

"I could live like this," she said. "I love where I'm at and I feel amazing."

She also gushed about how supportive her husband Mark has been.

"He is the guy who is disciplined," she said. "His whole thing is stick to it, be healthy, be fit and he does it for me ... I had three babies for him, but I also wanted to look fantastic into my 40's."

Will there be more babies for the former "Clarissa Explains It All" star?

"I thought so, but now we are exhausted," she said. "Now I feel great, so I don't know if I want to go back there!"