Just four months after having baby Ace, Jessica Simpson looks better than ever — and now you can learn her secrets! Find out exactly what she eats to keep her new, fit, post-baby body.

Jessica Simpson looked gorgeous shooting a new Weight Watchers commercial in the photo she shared on Twitter on Nov. 8. To get her body (and keep it), the mother of two focuses on eating five meals a day, that are high in both fiber and protein.

Jessica Simpson’s Diet Revealed

After having her second baby in June, Jessica had a hard time getting back into a diet routine.

“She admits she was dreading the first day of her diet, but once she started, she was like a well-oiled machine,” a friend of the singer told OK! magazine. “She had her routine down perfectly and everything was so much easier as a result.”

So, what routine is that? Well, it’s a three-step process — Jump Start, Intermediate, and “Rest of Your Life.” Jess is currently at stage two.

“She’s about to transition into phase three where you do two smoothies, two snacks and a meal, and then finally one smoothie, two meals and two snacks,” the friend added. Twice a week, Jess has “free” meals, for date night or such. Below is a breakdown of each meal!

Jessica’s Diet Breakdown: What 5 Meals She Eats

In the mag, they share an example of one of Jessica’s days by meals:

For breakfast, she mixes grapes, pears, avocado, spinach, lime juice and yogurt for a “Green Smoothie.”

If getting hungry before lunch, she goes with a protein-filled small dish like turkey slice with apple slices.

Then comes lunch time, when Jess has another smoothie. This time it’s a “Brown Smoothie,” composed of expresso, Stevia, whey powder and chia seed powder. Trainer Harley Pasternak named the Maxwell Mocha Smoothie (Jess’ daughter is named Maxwell).

For a mid day snack, Jess has a few celery sticks with about one tablespoon of peanut butter — a low fat, delicious snack.

This will hold her over until dinner — a grilled steak and baby spinach salad, that has 32 grams of protein. Extra Virgin Olive Oil is the dressing that Harley advises!

So, HollywoodLifers — will you try Jess’ diet?

— Emily Longeretta

More Jessica Simpson News:

1. Jessica Simpson’s Son Ace Makes Red Carpet Debut With Sister Maxwell
2. Jessica Simpson Shows Off Adorable Picture Of Baby Ace At 3 Months
3. Jessica Simpson Shows Off Mini-Me Daughter Maxwell’s Gorgeous Curls