When a slim Jennifer Garner stepped onto the stage recently at the Golden Globes in LA, the Versace-clad mom of two drew plenty of oohs and aahs. But her streamlined silhouette was a new look for the 37-year-old star, who was once famous for the super-muscular physique she showed off in action-hero roles.

"She's a size 0 now," an insider says about Jen, who has two
daughters, Violet, 4, and Seraphina, 13 months, with hubby Ben Affleck. "She used to be a size 6." That means after having her second child, Jen dropped the baby weight and more -- which was tough to do the first time, she's said. "I just wasn't that motivated," Jen said about taking time to lose the weight after Violet's birth.

"Then I got on the treadmill, stopped stuffing my face and lost the weight. I cut out croissants, bagels and muffins -- all the good stuff -- and went back to having
a salad once a day and protein."

For more on Jennifer's rapid weight loss, pick up the latest issue of Life & Style, on newsstands now!

Photo Credit: Startraks