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The ceremony was held between two oak trees on the Mooney family farm in Arkansas and was followed by an outdoor reception with the Ozarks visible in the background.
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Mooney's other other half, Dan Smyers, and the duo’s guitarist Justin Richards stood up as groomsmen for their bandmate.
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Billingsley's bridesmaids, including friends from her pageant days, wore dresses in muted blush and champagne tones, while the bride glowed in a gown by Ravini.
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The couple's now 10-month-old son Asher James — sporting a baby tux! — was carried down the aisle.
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"It has been a huge change and the best change,” Mooney told PEOPLE of welcoming son Asher in January. “You love each other a ton and then you have a kid and you never realize how much you could love something. It strengthens your love for each other, but it also just opens up this entire other deeper world of love that you never knew you could have."
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The couple, who have been together since 2014, got engaged in August 2016.
"She's the best thing that's ever happened to me, so I had to lock it down. She's my better — and much better-looking — half," the "From the Ground Up" singer previously joked to PEOPLE.
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"From the very first time I saw her, I knew I wanted to marry her," Mooney previously told PEOPLE of Billingsley.
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During the hilltop reception, Mooney became emotional while performing an original song he’d recently written for his new wife on the acoustic guitar.
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"Asher James, I promise to be the father you deserve. And Hannah, I promise to be the husband you want and need. I love you both so much. You’ve given me everything I never knew I needed," Mooney captioned an Instagram post upon Asher's arrival earlier this year.
The wedding was planned by Jessica Sloane and photographed by Heather Payne Photography. The event featured florals by Jessica Zimmerman, catering by Simply the Best, cake by Rick's Bakery and music by DJ Connection.
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