Happy Father's Day, Zach Roloff!

The Little People, Big World star celebrated his first-ever Father's Day just one month after he became a first-time dad! He welcomed a baby son named Jackson with his wife Tori Roloff in May, and she marked the holiday by gushing over her hubby on Instagram.

MORE: Tori Roloff Dishes on Baby Jackson on His 1-Month Birthday: “He’s Growing Like a Champ!”

"Happy Father's Day Zachary. There's not a single person I'd rather [be] taking this journey of parenthood with," she captioned a photo of Zach holding their newborn baby boy shortly after his birth. "Seeing you with Baby J makes me fall more and more in love with you. Jackson and I love you so much and we can't wait for many more Father's Days ahead!"

But even though Zach got a super special shout-out from her on Instagram, she also wished a Happy Father's Day to all of the important dads in their lives, including her father, Zach's dad Matt Roloff, and Zach's twin brother Jeremy —who is a father-to-be! His wife Audrey Roloff is roughly 30 weeks pregnant with their daughter.

MORE: Audrey Roloff Is Glowing in This New Baby Bump Snap — Take a Look

Zach and Jeremy's younger brother Jacob was missing from the shot and even though he isn't a father, it seems like the former LPBW star is settling into his role as proud uncle just fine! The 20-year-old shared an adorable video of his nephew cooing as he sucked on a pacifier on Father's Day Weekend.

"I love this kid a lot. Look at those eyes," he gushed in the caption.

View this post on Instagram

I LOVE THIS KID. ALOT. Look at those eyes..

A post shared by Jacob Roloff (@jacobroloff45) on

MORE: These 'Little People, Big World' Throwback Family Photos Are Everything

Jacob has not been seen on the family's hit TLC series since he decided to quit the show nearly two years ago, but fans can still follow along on Zach, Tori, Jeremy, and Audrey's stories as they navigate their lives as new parents.

Scroll thorough the gallery below to take a look back at Zach and Tori's relationship timeline!