(Cover) - EN Showbiz - Jessica Simpson has apparently cut down on junk food since giving to her daughter.

The 31-year-old fashion mogul welcomed daughter Maxwell a month ago and has already curbed her high-calorie habits.

Us Weekly claims that Jessica's dietary change is not just because of her multi-million dollar weight loss deal but also because of her baby's health.

"She's breast-feeding Max and wants her to get the best nutrition," a source told the publication.

Jessica had apparently indulged in Pop-Tarts and mac n' cheese while pregnant.

The new mother announced today that she has officially signed on to be a spokeswoman for Weight Watchers.

"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)," she wrote on her website.

"I have actually gotten a group of friends together who are going to be doing it with me. You can join me too and we can share our experiences here."

Jessica is also getting ready for her nuptials to fianc Eric Johnson but she told People that she would "love to do it before the end of this year but you just never know. I haven't set a date yet." (C) Cover Media