The pair, who wed in January 2019 after they met on his season of The Bachelor, are also parents to daughter 2-year-old daughter Alessi.
Lauren, 29, and Arie, 39, announced in December that they were expecting after revealing that May that she suffered a miscarriage.
Right after we decided on her name, we actually chose the next two for our boy and our girl,” she said.
The mom shared a photo of herself on Instagram with her daughter on May 23, writing that she was making the most of the time with her before adding two newborns into the mix.
We talk to her about the babies in my belly all the time and I try to put her hand on my belly when they’re moving.
As for whether they plan to have more children, she added: “We didn’t expect to have three right away, so it’s gonna be a very big transition for us.
“This time around has been different to say the least,” she began her caption, shared alongside a topless maternity photo showing off her baby bump.
The reality star added that she was “proud” of her body and grateful for the good and the bad, since that puts life’s moments in perspective.