Not that she needs the money, but JESSICA SIMPSON just scored a $4 million deal to drop her baby fat using Weight Watchers.

She says, "[I'm] so excited to be part of the Weight Watchers family.  "The cool thing about the program is that it focuses on healthy habits for the long-term (and I can still indulge in my guilty pleasures every now and then, too).  I have actually gotten a group of friends together who are going to be doing it with me."

Jessica reportedly put on 65 to 75 pounds during her pregnancy.  Meanwhile, Jessica debuts her daughter Maxwell in this week's issue of "People" magazine.  She scored $800,000 for the pics.  She says,  "Life has completely changed.  From how I sleep to what I think about, Maxwell has definitely taken over everything!  We stare at her all the time.  We can't get enough!"

Check out the cover pic.  (E! Online)