Simpson and baby Maxwell (Tony Duran for PEOPLE)
Simpson gave birth to Maxi via C-section two weeks before her due date, so, per doctor's orders, she isn't allowed to exercise for the time being. But when she gets the green light, the "Fashion Star" mentor is eager to get started. "After you have your baby it's like, 'Oh my God, what happened to my body?' This is not me," Jessica tells People. So, as previously reported, she's partnered with Weight Watchers to help her shed the extra pounds. "It would be nice to feel comfortable in a bikini, but that's not my goal," says Jessica, who has been juicing and eating lots of veggies and proteins. "I just want to fit into jeans!" Not surprisingly, motherhood has completely changed her priorities. "I'm less concerned about how my hair looks or if my gut is showing," she notes.
[Related: Jessica Simpson Baby: How Has Life Changed? (Video)]
Simpson with Johnson during her pregnancy (Sam Sharma/Bruja/PacificCoastNews.com)
While Simpson is looking forward to expanding her family down the line ("Having back-to-back has to be so hard, but I won't wait too long"), Maxi is her focus. "She's my career at the moment," notes the singer. "I know I was always meant to be a mom, and I think I'm doing a really good job."
For more about Jessica's new life with Maxi — and to see the first photos of the baby girl — pick up the June 11 issue of People.
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