Angelina's Fun Fit Secret

(Alberto E. Rodriguez/Getty Images for Hollywood Film Festival)

How does multitasking mom of six Angelina Jolie shed the barely-there baby weight? By using her children’s computer games to work out!

“The kids were convincing her that video games were more than just fun,” according to a source close to Angie. “They explained to her you can do anything from practice math to learn to read music and exercise.”

CLICK HERE for OK!'s Ultimate Angelina Gallery!

The source tells OK! that Angie’s eldest son Maddox, 7, was showing his mom — who, along with partner Brad Pitt, also has her hands full with Pax, 4, Zahara, 3, Shiloh, 2, and 4-month-old twins, Knox and Vivienne — the games for their Nintendo DS online when they discovered Let’s Pilates!.

"She tries to get in an hour of Pilates three times a week,” the source says. "She’s picking it up pretty quickly and is already at the hardest setting!”

CLICK HERE for OK!'s Ultimate Angelina Gallery!