Bodywatch

Revealed: Jessica Alba's Secret for Losing the Baby Weight!

By Amy Elisa Keith

08/19/2008 at 05:15 PM EDT

Just two months after giving birth to daughter Honor Marie, Jessica Alba is 25 lbs. lighter – and her trainer is telling PEOPLE just how she did it.

“Jessica went from a size 8 to a size 4 pretty quickly,” says Alba's longtime trainer Ramona Braganza. The actress – who flaunted her post-baby body at the ALMA Awards on Aug. 17 – has been opting for a low-fat, low-carb diet as part of Braganza's 321 Baby Bulge Be Gone plan.

She has been sweating, too: With an elliptical machine and treadmill at home, Alba, 27, has resumed her routine of core exercises, cardio and circuit training.

"The baby always comes first, but Jessica definitely set goals for herself,” says Braganza, who now trains Alba six days a week.

And having a workout buddy helped. “She loves working out with a girlfriend,” says Braganza, whose client, actress Jamie King, frequently trains with Alba.

Says Braganza: “Jessica has made amazing progress in a very short time.”

For the complete story, pick up this week's issue of PEOPLE, on newsstands Friday