Every mom stresses over losing the baby pounds. But super-fit Jessica Biel already has the perfect go-to weight-loss plan: the Paleo diet, which limits refined sugars and grains and has helped her slim down in the past.

RELATED STORY: Pregnant Jessica Biel's Baby Bump Looks Huge in New Instagram Photo

"It's very healthy, but she'll need to make sure she's meeting her postnatal calcium needs," says nutritionist Keri Glassman, who has never treated the actress.

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Jessica's hubby, Justin Timberlake, kissing her growing baby bump.

Throughout her pregnancy, Jess did prenatal yoga and hiked, but post-baby, she'll add running and strength training.

"She incorporates a lot of variety into her workouts, which is important to help re-tone postnatal," says Glassman. "If she's diligent, the weight will probably be gone by 12 weeks or so."

We have no doubt that Jess will debut a hot post-baby bod in no time!

Read more about Jessica’s pregnancy in the new issue of ‘Life & Style,’ on newsstands now!