Jessica Simpson has adopted a more healthy approach to food and exercise during her second pregnancy in a bid to keep her weight under control.

During her first pregnancy, the “Fashion Star” mentor enjoyed a more carefree lifestyle with limited excercise. However, Simpson, 32, has since changed her ways, and it appears to be paying off.

“She thinks about what she puts in her body now. She’s not starving herself, but she’s eating sensibly,” a friend of Simpson’s told In Touch magazine.

Simpson has swapped high-fat foods for low-calorie meals such as green eggs (eggs and spinach) for breakfast, which is said to be the singer’s “new favorite.”

“She loves it,” the friend said before revealing that Simpson regularly works out with celebrity trainer Harley Pasternak.

“[She] just likes feeling good and when she exercises regularly, she feels great,” the insider explained.

And everyone notices the difference. “I’ve never seen her this happy,” says her friend. “She keeps saying that her life couldn’t be better.”