ChipandJoanna Gainescan’t imagine life any other way now that they’ve welcomed sonCrew, but his addition to their family wasn’t exactly put into motion on purpose.

“When I saw the results of the test, my jaw dropped,” Joanna, 40,told PEOPLE in aMay cover story about taking a pregnancy test after “feeling a little emotional and crazy.”

She continued of her 43-year-old husband, “Chip was in the driveway about to leave when I called him back and said, ‘We’re pregnant!’ Hewas so excited. We’re both just so excited.”

Larsen and Talbert

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Joanna Gaines/Instagram

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Perry Hagopian

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Chip and Joanna are also parents toEmmie Kay, 8,Duke, 9,Ella, 11, andDrake, 13 — and they’re already thinking about what will happen when their four older kids are one day out of the house.

“We think about things like when Emmie goes off to college this little one will only be 10,” Joannatold PEOPLE in April. “It’s just crazy to think how wide that gap is, but Chip just loveshanging out with the kidsand it’s just such a sweet thing.”

For more about Chip andJoanna Gaines’ newly expanded family, pick up the latest issue ofPEOPLE,on newsstands now.

source: people.com