How did Jennifer Love Hewitt get her hot bod?

An infomercial!

“I just got this machine called the Ab Circle Pro — I ordered it off TV, and I love it!” the 31-year-old Ghost Whisperer star tells UsMagazine.com about the $200 fitness machine that helped her get her flat belly.

She adds: “It’s amazing. It’s probably my best secret!”

What else does the 5-foot-3 actress — who lost 15 pounds last summer — do to stay fit?

For her upper body, she says she does “three sets of 20 push-ups, [dumbbell] flys, bench presses, shoulder presses and bicep curls” three to four times per week. She also does the same amount of lunges and squats before focusing on her core and doing 30-second body planks and a few sets of 20 crunches.

“Usually with my trainer, we also mix in some interval training, like 10 minutes on the treadmill or jumping rope,” she says of her cardio routine. “On days that I can’t get to her, I do the elliptical or the treadmill for 30 minutes or so each time.”

Hewitt isn’t just displaying her svelte figure at the gym. She also ditched her dowdy duds and has begun showing off her curves in body-hugging dresses by Phillip Lim and Herve Leger.

“I’ve kicked up the glam,” the star — who recently split from costar Jamie Kennedy, 39 — tells Us. “You carry yourself differently in things finished with dazzle.”

nFrom US Weekly