Jessica Simpson on the set of her unknown commercial in Los Angeles,CA. Credit:

Talk about a force of mother nature! Jessica Simpson and her growing baby bump made an appearance on the L.A. set of a commercial shoot on Monday, Feb. 25 -- dressed to impress in a skintight leopard-print dress, which is her own design on sale now at Dillard's.

The Fashion Star mentor, 32, looked radiant as she strutted around the set in sky-high black pumps, her blonde hair carefully curled and a black cardigan barely covering her pregnancy curves.

On hand to offer Simpson some moral support was fiance Eric Johnson and their 10-month-old daughter Maxwell, who made a little fashion statement of her own with a tiny pink bow in her hair.

This isn't the first time Simpson has taken a walk on the wild side, however. The second-time mom-to-be also donned a leopard-print dress when she was pregnant with little Maxwell back in December 2011.

The couple first announced their second pregnancy back in December, which came as a surprise to them too, Simpson revealed in an interview with Jay Leno in January.

"I was extremely shocked," Simpson told The Tonight Show host. "Because I was going through a lot of hormonal changes, trying to get back to the old, vibrant Jessica. You know, it was kind of like a one-night stand. And it happened, all over again!"

The ecstatic mom told Leno at the time that she and Johnson want to plan a wedding, but "he keeps knocking me up."

"We're doing it very backwards, I know … I'll just keep my legs crossed, I guess, this time!" she said with a laugh.