Joe Don and Tiffany, who were married in 2006, have one son, Jagger Donovan, who will be two years old in May.
"We’re a little more prepared but the same excitement is there," Joe Don tells PEOPLE of getting ready for baby No. 2. "There’s such fulfillment in being a father and it’s going to be two-fold now, which is so cool."
People reported that Mom and dad are eager to prepare as well, and plan to find out the sex of the baby. "Tiff’s all about decorating rooms, so she’s got to know. She’s got to prepare the nest," says Rooney, who is betting on a girl while Fallon suspects it’s a boy.
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