Photo: George Burns/Harpo Studios

Despite being movie stars, both Tom and Julia put their jobs as parents first. Tom has four children, Colin and Elizabeth Ann from his first marriage, and Chet and Truman with Rita.

Then, in February 2011, Tom became a grandfather when Colin and his wife welcomed a little girl, Olivia Jane. "It's fabulous," he says. "When you have your own kids, you might not be aware of how new everything is—that their little brains are being imprinted for the very first time. But now, if you don't see them for two weeks, which has happened, it's a huge difference from leaving her and then seeing her two weeks later. She's like a completely different human being."

Julia loves motherhood so much, she recently produced and hosted the documentary Extraordinary Moms for OWN, in which she tells the stories of mothers around the world, including Secretary of State Hillary Rodham Clinton. "Some famous [moms] and some not," she says. "But all courageous and inspiring."

More from the show
Julia and Tom share their favorite things!
Get to know this dynamic duo   
Memorable moments on the Oprah Show