Kristin Cavallari gave birth to her second son, Jax, in May.
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However, she's already dropped 20 pounds and is close to reaching her pre-pregnancy weight.
"I'm still a couple of pounds away from my pre-pregnancy weight, but it took a solid three months with [my 23-month-old son] Camden and I think it will be the same this time," the former reality TV star told E! News. "I've really been focusing on my legs and butt. My stomach needs the most work but that takes time more than anything and diet plays a huge role."
Cavallari, 27, who married to NFL quarterback Jay Cutler last year, said that her workout regimen includes four to five workouts at home each week, including squats, lunges and weight lifting. In the next few weeks, she'll begin taking Pilates classes.
Meanwhile, her diet, chock full of organic veggies, chicken, beef, bison and fish, has remained the same.
"I either make a smoothie, oatmeal or eggs for breakfast and a salad or turkey sandwich for lunch. I have a snack in the afternoon—usually nuts with dried cherries, chips with hummus, or an apple and almond butter," she said. "I also love avocados with olive oil and sea salt and I put coconut oil in or on everything."
While getting in shape has helped her maintain the energy required to keep up with two growing boys, the former reality TV star also gushed that she was excited to fit into non-maternity clothes again.
"I couldn't wait to wear this... romper," she gushed. "Anything with a waist!"