The Weight Watchers spokesperson - who lost 50 pounds before marrying Eric Johnson in Montecito, California earlier this month - took to Instagram to show off her slender physique yesterday (11.08.14) and credited her time in the gym for boosting her body confidence.
The 33-year-old beauty - who has a son, Ace, 13 months, and daughter Maxwell, two, with her husband - posted a shot of herself and a friend wearing revealing swimsuits and heels on the picture sharing site as she celebrated her sister, Ashlee's Hawaiian themed bachelorette party.
She captioned the image: "Oh yea girl...We are proud to be in our bathing suits!! @baylormcg #hardworkpaysoff #workoutpartnersforlife."
Although she is more than happy to show off her toned body, Jessica is said to be planning to lose even more weight after becoming "an exercise addict".
A source recently told In Touch Weekly magazine: "She's been the smallest she's been in years, and she still doesn't think it's good enough.
"She is determined to get even thinner."
While another insider claimed that her excessive exercising has even caused her to pass out.
They said: "[Jessica] wants to get down to 93 pounds. She's become an exercise addict.
"She walks six miles a day, strength-trains three times a week and constantly runs on a treadmill. She's gotten so carried away, she's fainted on a few occasions."