Since giving birth to Bronx Mowgli last November, Ashlee Simpson-Wentz has been determined to get her pre-baby body back.

She recently kick-started her weight-loss program with Jackie Keller’s 30-day Body After Baby plan, which offers "mommy and me" workouts, such as playing peekaboo.

Ash also supplements the workouts with Nutrifit meals and snacks, delivered daily. The 24-year-old new mom is now half-way to her goal of shedding 30 pounds and has been eating healthy.

"She’s swapping french toast and sugary syrup for multi-grain bread and berries," a pal of the singer tells OK!. And when her hubby, Pete Wentz, 29, brings home pizza, she has a slice, but loads it up with veggies.

Of course, Ashlee recently rushed to the defense of her big sister <a href="" target="_blank"><strong>Jessica Simpson</strong></a>, when she wrote on her blog that, "all women come in different shapes, sizes, and forms and just because you’re a celebrity, there shouldn’t be a different standard."

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