June 20, 2011— -- Heidi Montag has replaced her penchant for plastic surgery with extreme exercise.
"I've been working out from, like, 5 a.m. to 7 p.m. for two months now," Montag told US Weekly magazine at a pool party in Las Vegas this weekend. "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."
The 5' 2'' reality star, first known for her role on MTV's "The Hills," says she is down to 103 pounds, dropping 27 pounds after hitting a personal high of 130 this year. Montag said that she took a year off from the gym after her marathon of at least 10 plastic surgery procedures in late 2009.
"My breasts, because they're so big, really needed some time," she explained. "Sometimes I get shooting pains, but I hear that's normal."
Montag dramatically reshaped her face and body in a marathon plastic surgery session, which included breast implants, a brow lift, botox, a nose job revision, fat injections in her cheeks, a chin reduction, neck liposuction and having her ears pinned back.
Facing intense criticism, the 24-year-old seemingly went from a Hollywood starlet to tabloid target overnight.
In a November 2010 interview with ABC News' Cynthia McFadden, Montag said she felt like she'd become a prisoner in her own made-over body.
"Sometimes I wish I could go back to the original Heidi," she said. "I don't want the biggest boobs in the world and, to be honest, I would take them out and downsize them but I don't want to go under the knife again. I feel like I'm stuck with them now."
After much media scrutiny, Montag admitted that she was addicted to plastic surgery and believed that the grueling procedures and recovery weren't worth the outcome.
"I don't want to do that to my body again. I don't want to get any more Botox or any more surgery, or any more lip injections. I think I'm fine the way I am," Montag said in 2010, offering a message of caution to others who are considering going under the knife.
"I hope that people really hear what I'm saying about plastic surgery, and I hope they really hear that I'm saying I would take it back," she said. "I almost risked everything, all my relationships and myself, for vanity."
People magazine reported at the time that Montag's mother was "horrified" by her surgeries.
Montag caught the public's eye on MTV's "The Hills," and her star continued to rise on the reality show "I'm a Celebrity, Get Me Out of Here!" The sudden fame and the pressure of trying to compete with the other girls on "The Hills" helped push Montag to believe that radical re-invention was the only way into a successful Hollywood career.
"I got really insecure once I got immersed into Hollywood. A lot of girls my age get almost as much surgery, I would say, as me. ... All these celebrities have different faces. Nobody calls them out because they don't talk about it," Montag said, adding that talking publicly about her surgeries was a mistake. "I shouldn't have talked about it because it just opens it up for everyone."
ABC News' Eileen Murphy and Roxanna Sherwood contributed to this report.