She had three children almost back to back, which took a toll on her body.
But two years ago Melissa Joan Hart dropped 40 pounds thanks to regular exercise and signing up with Nutrisystem, which she is the spokesperson for.
On Monday the 39-year-old Melissa & Joey star showed off her trim waistline in a plunging swimsuit as she posed with her mother Paula, 59, for an Instagram snap to promote World Oceans Day.
'Happy #WorldOceansday from me and my mom,' the former teen star wrote in her caption,
'Let's take special care to be good to our oceans and our Mother Earth. #Atlantic #Pacific #Indian #Arctic #Gulf.'
Though her mother, a former talent manager, is decades older than her celebrity daughter, the two looked very similar in their fashionable one pieces.