Little People, Big World stars Jeremy Roloff and Audrey Roloff have a baby on the way.

"The secret is out... I'm going to be a dad!" Jeremy captioned a Wednesday Instagram photo of the couple holding up sonogram photos and a little jacket.

"The author and creator of life has entrusted us with our first child -- wow. Inevitably this means some big exciting changes for us this year, we're excited to embark on this journey and share it with you all.
We're praying for a healthy baby Roloff! #journeyofjerandauj: @dawn_photo #beating50percent."

The couple learned they're expecting their first child together after attending a Saturday gender reveal party for Jeremy's twin, Zach Roloff, and his wife Tori, who found out she's pregnant with a baby boy, Us Weekly reported.

After returning home from the bash, Audrey began feeling sick and therefore took a pregnancy test -- which turned out to be positive!

"I was so surprised," Audrey, a 25-year-old Barre instructor told Us of discovering she's going to be a mom. "It didn't hit me until I heard the heartbeat at our first doctor's appointment."

Jeremy revealed that his father Matthew, 52, "teared up" and mother Amy, 51, "screamed" over the news.

"We want at least four [kids]," the 26-year-old photographer told the magazine. "We love the idea of a big family."

Audrey is currently in her second trimester and she's reportedly craving sour treats, and according to Jeremy, "all the worst candy!"

The couple's baby is due September 1, only four months after Zach is expecting to welcome his child into the world in May 2017.

"Zach wants his kid to boss ours around the same way Jeremy bossed Zach!" joked Audrey, who is happy her child will have a cousin close in age.

Jeremy got married to Audrey in late September 2014 at Roloff Farms in Hillsboro, OR.
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The pair got engaged in March of that year on the heels of his parents -- who have dwarfism and four children, including Molly Roloff and Jacob Roloff -- announcing their surprising separation after 26 years of marriage. Matt and Amy filed for divorce in June 2015 and the paperwork was finalized in May 2016.

One week ago, Jeremy wrote about his history with Audrey on social media: "My 3 sentence love story: We met on a blind date before church and I fell in love, she did not. We were friends for a year, I told my mom I was going to marry this girl, but it was another 2 years of pursuit. A couple hundred campfires and truck rides later, I asked her to be mine 10 days before moving to California, our love endured, and September 20, 2014 we started our forever."