Heidi Montag says she has been working out for about 14 hours a day for the past two months after being what she called "a lot overweight" and has lost more than 25 pounds.
Montag, who is 24 and has always appeared slim on television, is best known for her role on the MTV reality series "The Hills," which ended last year after six seasons, and famously underwent 10 cosmetic surgeries, including a breast augmentation. She told Us Weekly that she had taken a year off from the gym after her body transformation.
"I've been working out from, like, 5 a.m. to 7 p.m. for two months now," Montag told the magazine. "I've been working out really hard because I had this pool party and I was like, I have to be in shape. And I was actually a lot overweight. It was the most I've ever been because I've kind of been in hiding eating pie with my husband and puppies, so I needed to get back in shape."
"My breasts, because they're so big, really needed some time," she added. "So I'm just starting to work out again after my surgery. Sometimes I get shooting pains, but I hear that's normal."
The 5'2" reality star says she weighed 130 pounds at her heaviest and slimmed down back to 103, the magazine said. She did not specify how long it took. She told Us Weekly she has been "running a lot" and weight-lifting.
According to U.S. government standards, Montag's weight at her heaviest would likely be considered normal for a woman of her height with an average amount of body fat and muscle.
Montag spent time over this past weekend partying in Las Vegas with Crystal Harris, the 25-year-old Playboy Playmate who ended her engagement to Hugh Hefner last week.
"@CrystalHarris I had so much fun dancing with you to the #worldpremier of #ClubQueen!" Montag Tweeted on Sunday, June 19, referring to the single Harris released on June 14, the day she announced that she had called off her wedding to the 85-year-old Playboy founder. "Its stuck in my head! Entertain me! LOL!"
Montag is meanwhile preparing to return to reality television with a new VH1 show, "Famous Food," which will see her and others try to open a restaurant.
The series also stars Ashley Dupre, the call girl at the center of the Elliot Spitzer sex scandal in 2008, former "Bachelor" star Jake Pavelka, "Real Housewives of New Jersey" cast member Danielle Staub, Vincent Pastore from "The Sopranos" and DJ Paul and Juicy "J" from the rap group Three 6 Mafia.