Zach Roloff has become a first-time dad.

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The 27-year-old "Little People, Big World" star announced Sunday on Mother's Day that wife Tori Roloff gave birth to son Jackson Kyle on May 12.

"#zandtpartyofthree Jackson Kyle Roloff. Born May 12th at 8:00am 9LBS 1 oz 20.5 inches long. #storyofzachandtori #weekendidos #nofilter love him," he captioned a photo on Instagram with his family.

"Mom and Dad are so in love with you already #ZandTpartyofthree," Tori added on her own account.

Roloff said in a statement on the TLC website that Tori and Jackson are "doing great."

"Jackson is already mastered holding daddy's fingers and snuggling with mom! He is adorable and Tori and I are loving being parents," he added.

Roloff and Tori married in July 2015, and announced in November that they were expecting their first child.

"We're super excited," Tori told People, with Roloff adding, "I'll be a fun, hands-on dad, but also the disciplinarian. Tori will be a loving mother hen."

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"Little People, Big World" follows Roloff and his family as they live and work on their farm in Oregon.

Roloff and his parents, Matt and Amy Roloff, all have dwarfism and stand under 4'3" tall, while Roloff's twin brother, Jeremy Roloff, and siblings Jacob and Molly Roloff are of average height.