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Jessica Simpson knows how to dress that post-baby bod of hers.

Two months after giving birth to her second child, son Ace Knute, the singer was spotted leaving Sagebrush Cantina in Calabasas, CA with fiance Eric Johnson and their adorable little girl Maxwell.

And doesn't Jess look great?

With some perfectly coiffed hair, skinny jeans and a tiger print top, Simpson looked happy and healthy, embracing her post-pregnancy physique.

"I had a healthier pregnancy," she tells UsWeekly about having Baby #2. "I am just one of those women who gains a lot of weight. I have really big boobs. I have my curves."

In case you missed out, check out the first photo of little Ace right here -- and see more celebrity kids in the gallery above!

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