"With two kids, we have our hands full, but every day is a new adventure." So says Jessica Simpson, who became a mom for the second time when she welcomed little Ace Knute Johnson to the family on June 30. "It's fun! I feel very at peace with being a mom," the 33-year-old tells Us Weekly. "Pregnancy is a lot. It was hard to do two so close together," she acknowledges. "I have this huge sense of accomplishment, and I feel in my heart that I'm done. But obviously, accidents do happen!"