Jessica Simpson posted this shot of her three-month old son Ace on Twitter on Saturday, and we can't get over how cute the little boy is!

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

The 33-year-old singer also revealed that having children with fiance Eric Johnson has only strengthened their bond. "My relationship with Eric has only grown stronger with the additions to our family," Jess told Hello Magazine. "I love seeing him as a dad. I feel like I reached a new level of love for him and I didn't think I could love him any more than I did ... Eric is incredible. I can safely say he has changed way more diapers than I have. Any time either of our babies needs anything, Eric is right there. I am so lucky to have him.''