Singer/actress Jessica Simpson has shown off her newborn baby son Ace Knute for the first time and revealed she is not planning on having any more kids.

Simpson became a second-time mum in June (13) when she and fiance Eric Johnson welcomed Ace, who is a brother for their 15-month-old daughter Maxwell.

The doting parents are revelling in looking after the new addition to their family but Simpson has revealed she does not want to extend their brood any further - barring accidents.

Unveiling Ace in a photoshoot for U.S. magazine UsWeekly, she says, "With two kids, we have our hands full, but every day is a new adventure. It's fun! I feel very at peace with being a mom.

"Pregnancy is a lot (of work). It was hard to do two so close together. I have this huge sense of accomplishment, and I feel in my heart that I'm done. But obviously, accidents do happen!"