Ace Knute is cute!

Jessica Simpson's first son makes his big public debut on the cover of Us Weekly -- where he's seen posing with his famous mama and older sister, Maxwell.

And one thing's for sure, those lips definitely run in the family.

Ace, who was born almost two months ago via C-section on June 30, looks adorable in the photo ... and how gorgeous is Jessica?!

"With two kids, we have our hands full, but every day is a new adventure," the 33-year-old singer tells the mag about life with fiance Eric Johnson and their two little ones. "It's fun! I feel very at peace with being a mom."

And are there any more kids on the way? She's not totally ruling it out.

"Pregnancy is a lot. It was hard to do two so close together," she says. "I have this huge sense of accomplishment, and I feel in my heart that I'm done. But obviously, accidents do happen!"
Click here to get a look at Jessica's post-baby bod -- and see more cute celeb kids, including little Maxwell, in the gallery above.

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