Jessica Alba wants the world to know her body-after-baby secret — and it has nothing to do with celery sticks or crunch­es at the gym, reports.

“I wore a girdle,” the actress, 28, tells the March issue of Elle. “Eight weeks after my girlfriend had her baby, you could see her six-pack. She told me to put an elastic band around my waist — any kind of band or girdle works.”

Adds Alba, “I didn’t recover as fast as she did. I don’t have a six-pack — that’s just not my body at all.”

The actress confesses that she tried working out to get in shape for a calendar shoot, but quickly gave it up. “(The workouts) were horrible,” she tells the magazine. “I cried. And I haven’t worked out since.”