The singer-turned-fashion designer appears in this week's issue of Us Weekly with the baby - who was born on June 30 - and her fiancé Eric Johnson.
According to the New York Post newspaper, Jessica and former NFL player Eric received the six-figure sum from the publication for the exclusive.
Jessica, 33, Ace and her 15-month-old daughter Maxwell appear on the front cover of Us Weekly - which hits newsstands on Friday - and in the issue she reveals that she and Eric, 33, have their "hands full" with two kids.
Jessica said: "With two kids, we have our hands full, but every day is a new adventure. It's fun! I feel very at peace with being a mom."
The blonde beauty found out she was expecting Ace just six months after giving birth to Maxwell and she now plans to take a break from being pregnant.
She added: "Pregnancy is a lot. It was hard to do two so close together. I have this huge sense of accomplishment, and I feel in my heart that I'm done. But obviously, accidents do happen!"
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