Melissa Joan Hart is ready for swimsuit season!

"The Sabrina: The Teenage Witch" star revealed her 40-pound weight loss via Instagram on Monday, writing, "Here it is! One of my swimsuit pics from my recent @Nutrisystem shoot. I feel confident and full of energy! Who's ready to hit the beach with me? #still40poundsdown #almost40."

Don't "#almost40" us, Melissa -- you look so great!

Earlier in the day, the 39-year-old actress gave us a peek at what was to come with a coy pic, writing, "Sneak peek! Trying on swimsuits has never been so fun! Check back to see my favorite. #readyforspringbreak."

Good thing she's got that new suit, too, because Hart appears to be traveling! Shortly after her hot bod reveal, she shared a snap with her adorable sons, Mason, 10, Braydon, 8, and Tucker, 3. "Hey Phoenix, anyone got a toothbrush we can borrow? #stuckforthenight. #planestrainsandautomobiles," she wrote on Instagram.

Melissa has been a spokesperson for Nutrisystem for some time but has said in the past that she never lets her body goals come before parenting ones.

"For me, it was important to bond with my child, as opposed to 'lose the weight," she told ET on set of a 2014 commercial she shot for the weight loss program. "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."