Kelly Preston: How I Lost 39 Pounds!

The actress credits best friend Kirstie Alley's new weight-loss program with helping her shed her baby weight

Though it's only been a year since Kelly Preston gave birth to her son Benjamin, she's already lost her pregnancy weight -- and then some. What's more, the 49-year-old says she's in better shape now than she was 20 years ago! So what's Preston's secret to that svelte physique? Having Kirstie Alley as her best friend.

"When I got pregnant at 48, I didn't know if my body would bounce back," says Preston, who's married to John Travolta. But the actress actually ended up losing 39 pounds -- before Ben even celebrated his first birthday!

She attributes the impressive weight loss to Alley's Organic Liaison weight-loss program, Rescue Me, -- which, according to the website, is a diet plan that employs an organic supplement system to target cravings and boost a person's "natural energy."

"It's pretty much the most genius thing ever," Preston tells People. Kelly thinks it's so genius, in fact, that she just signed on as the program's new spokeswoman.

Considering Preston's weight loss and the fact that Alley herself has lost a staggering 100 pounds on the program, it sure sounds like Rescue Me works.

Of course, simply maintaining a healthy diet and taking those organic supplements  isn't enough to make the pounds disappear; exercise is also essential. To this end, Preston also played tennis and stayed super-active by keeping up with her newborn baby's lifestyle.

"I lost 39 lbs., have more energy than I had 20 years ago -– and I feel amazing," Preston says. "I'm going to be turning 50 next year –- holy s***! Hey, 50 is the new 30."

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