"We are so excited," Jessa, 22, tells PEOPLE. "I said, 'Hey Ben, guess what? Yeah, you're a dad.' We couldn't believe it." Adds Ben, 19, "We are looking forward to being parents."
While the third daughter born into the Duggar family and her husband (the oldest of seven brothers and sisters) revealed plans to originally adopt, the couple, who star on TLC's hit show 19 Kids and Counting, couldn't be happier about their baby on the way.
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