Jessica Simpson debuts son Ace Knute Johnson

Meet Jessica Simpson's new man.

The singer debuted her son, Ace Knute Johnson, on the cover of Us Weekly, posing with him and daughter Maxwell.

Simpson and fiance Eric Johnson welcomed Ace on June 30. She gave birth to Maxwell, 15 months, last year.

"With two kids, we have our hands full, but every day is a new adventure," Simpson, 33, told the magazine. "It's fun! I feel very at peace with being a mom."

Simpson announced the pregnancy news in December, and told Jimmy Kimmel in March that they were expecting a boy.

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

Simpson's issue of Us Weekly hits newsstands on Friday.