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Jessica Simpson shows off 70-pound weight loss in sexy swimsuit photo

Jessica Simpson's 70-pound weight loss: Her low-carb diet and workout secrets
Jessica Simpson's 70-pound weight loss: Her low-carb diet and workout secrets
Jessica Simpson Instagram

Jessica Simpson feels on top of the world after losing 70 pounds during the past year. Simpson, 33, flaunted her fit swimsuit body on Instagram, where she spotlighted her muscular legs.

"If I'm in a bathing suit I should pose proudly," she wrote in the caption. The buxom 5-foot-3 Jessica has shed more than 70 pounds since giving birth to son Ace Knute in June 2013. Simpson lost the same amount of weight six months after giving birth to daughter Maxwell in May 2012.

Low-Carb Weight Watchers Diet and Circuit-Training

Simpson, a rep for Weight Watchers, has credited a low-carb diet and rigorous daily workouts for her dramatic weight loss. Jessica's diet typically features a mix of high-quality proteins like salmon and chicken and fresh vegetables and salads. Simpson also avoids processed foods and limits sugar.

In 2005, Simpson slimmed down to 115 pounds for the film, "The Dukes of Hazzard," by following the low-carb Atkins diet, but has since incorporated more carbs into her meal plan to avoid carb binges.

For exercise, the mom of two walks four to five miles every day (or 8,000 to 10,000 steps) and does yoga. Simpson also works out at the gym for 45 minutes, four days a week, with her longtime trainer Harley Pasternak, creator of the 5-Factor Workout DVD.

Jessica confessed her pregnancy weight gain made her depressed and demoralized. "I was so insecure; I couldn't even believe what I weighed," she told ABC News. "I don't think I ever expected to see the numbers that I've seen on the scale."

Simpson's longtime trainer, Harley Pasternak, said the foundation of Jessica's workout routine is daily walking. Pasternak, author of The Body Reset Diet, also trains Halle Berry, Lady Gaga, and Kim Kardashian.

Pasternak and Simpson typically work out at the gym four days a week, combining 10 to 20 minutes of cardio exercise, 20 to 30 minutes of resistance training, and lots of flexibility moves.

My Weight Problems Spawned a Billion-Dollar Empire

Ironically, Jessica said her weight struggles are part of the reason she's so successful with her clothing line, which boasts annual sales of $1 billion. Simpson said women relate to her because she's not naturally skinny and has weight issues, just like many of them do.

“I have been every size on the planet and I understand women,” she told Forbes. “I definitely go up and down with my weight, and I'm really honest about it. If I'm 5 pounds heavier, if I'm 50 pounds heavier, or 5 pounds lighter, I just don’t think it should define who you are."

Simpson is glad she never caved in to the extreme pressure to resort to starvation diets or other unhealthy measures. "I was proud of myself throughout that period for not doing every crash diet and trying to get as skinny as I could, or not eating," she said.

Jessica, who recently amped up her diet and workout regimen ahead of her upcoming wedding to former NFL star Eric Johnson, has been hurt by the cruel media fat-shaming over the years, but said it taught her valuable lessons about body image and self-esteem.

"Tune into yourself and tune out the world," she said. "I think it's always good to go inward. There is some sort of god in all of us that can make us powerful."