Just three months after giving birth, Jessica Simpson flaunted her post-baby body in a mini black dress.

The 33-year-old mother of two was spotted filiming a 30-second Macy's ad in a tight dress that revealed her curvy figure.

The Daily Mail noted that in the ad below, a Macy's representative tells Simpson that the store will ship the boots from her successful clothing line to Minneapolis.

"You should ship the boots to Miami, because they're hot," Simpson suggests.

Another rep then says, "She's Jessica Simpson. Everything she says is funny!"

The actress then responds and says: "Corn muffins! Leprechaun! Orthodontia!"

Jessica Simpson's Collection is doing very well since it became the first celebrity brand to break $1 billion in annual sales in 2006.

Her clothing, shoes, handbags, sunglasses, jewellery, and fragrances are carried in an impressive 650 department stores across the US.

But despite her successful brand, Simpson still wants to make music.

"I need to make music," she tweeted Wednesday.

On Tuesday, she had a mommy night out after she was spotted leaving Sagebrush Cantina in Calabas, Calif. with fiance Eric Johnson and 16-month-old daughter Maxwell.

Simpson looked looked beautiful in an all black ensemble of a blazer, shirt and skinny pants.

She recently opened up to Us Weekly about how her daughter is adjusting to being a big sister to baby Ace.

"She was the first to meet Ace. At first, she kind of pouted a little bit because she's a daddy's girl and Eric was holding Ace and couldn't pick her up," she shared. "Now she's holding the baby. It's so cute to see. She carries two baby dolls around and we change their diapers. So she's a mom too!"