The singer, actress and fashion designer piled on the weight while she was carrying her daughter with fiancé Eric Johnson, Maxwell.
Apparently Jessica - who has become a spokesperson for the Weight Watchers brand - had her first weigh in a few weeks after giving birth on May 1.
The 32-year-old star signed a deal for $4 million to shed the excess weight as face of the company.
Her contract requires a 20 to 30 pound loss by the end of August or she will reportedly not receive the agreed amount.
A friend of the ambassador told website UsMagazine.com: "Jessica has always had issues with junk food."
The 5-foot-3 `Fashion Star` mentor is rumoured to have enlisted her mother, Tina, and a few friends to do the program "to help keep herself in check," according to the insider.
Jessica, who plans to breast-feed through July, also ditched her beloved high-calorie margaritas, claims the close source.
The insider added about her healthy new diet regime: "She had a few drinks post-pregnancy, but then stopped."
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