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Pacific Coast News 1 / 15

Jessica Simpson is in it to win it!

As part of a $4 million deal with Weight Watchers, the 31-year-old first-time mom is psyching herself up to revamp her eating and fitness routines -- and is she sharing the journey with her 5.5 million Twitter followers.

"What we put in our bodies mirrors our Self-Worth!" the singer and fashion mogul wrote. "#INSPIRED."

PHOTOS: Jessica's body evolution

One example of junk-food-loving Simpson's dietary evolution? The one-time lover of Scotch and margaritas kicked back last Saturday night with a big glass of ... water!

"Responsibility has drastically changed my life "Saturday night drink of choice.... WATER! :)" said the star, who welcomed daughter Maxwell Drew Johnson on May 1 with fiance Eric Johnson.

Back in late winter, the then-heavily pregnant star told ELLE mag that abstaining from booze was a challenge at first.

PHOTOS: Jessica's bump watch

"Givin' up my Scotch? My Macallan 18? That was hard for me! Though now being pregnant, you crave other things. A big thing of water sounds great!"

According to a source, the star gained 70 pounds during her pregnancy.

PHOTOS: Jessica's worst outfits ever

"[Weight Watchers] focuses on healthy habits for the long-term (and I can still indulge in my guilty pleasures every now and then, too)," the new mom explained on Facebook. "I have actually gotten a group of friends together who are going to be doing it with me."


Jessica Simpson buys her Weight Watchers group pedometers

Simpson tweets photo of baby Maxwell

Gaining weight was good for Simpson brand