Jessica Simpson Debuts Baby Son Ace [PHOTO]

On June 30, Jessica Simpson gave birth to a baby boy she and fiance Eric Johnson named Ace Knute. And now she's ready to show off the newest addition to the family.

Jess, Ace and big sister Maxwell Drew are all pictured on the cover of the newest Us Weekly, and Simpson tells the magazine she feels "very at peace" with being a mom.

"With two kids, we have our hands full, but every day is a new adventure," the 33-year-old singer added. But since she had Ace and Maxwell pretty much back-to-back, she's ready for a breather.

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

The good news is that at least we're pretty sure she now understands just how babies are made.