"The baby's growing up quick, starting to crawl and getting into all kinds of trouble and it's fun," Lachey tells Us of son Camden, whom Lachey welcomed with wife Vanessa Minnillo in September 2012. "It's fun being a dad. It's fun having a son and family life is great."

Giuliana Rancic says watching her husband interact with their child makes her heart soar. "I love seeing Bill and Duke together. After Duke's morning feeding, Bill puts him on his stomach (with Duke face up) and they take a little nap together," the proud mom revealed weeks after Edward Duke's August 2012 birth. "It is the sweetest thing to witness."