updated 11/29/2011 AT 11:00 AM ET
•originally published 11/28/2011 AT 5:15 PM ET
When Kelly Preston gave birth to her son Benjamin Travolta a year ago, she knew losing the baby weight wouldn’t be easy.
“When I got pregnant at 48, I didn’t know if my body would bounce back,” the actress tells PEOPLE.
Turns out, Preston had no need to worry. Not only did she shed the baby weight, but over the past year she’s dipped below her pre-pregnancy weight – and is relishing a new figure and renewed vitality as she approaches the mid-century mark.
“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.”