Witney, Carson, and their two-year-old son Leo have been living in their native Utah.
After including palm tree and sun emojis, the pregnant pro dancer continued, "As hard as this change might be, I know it's right for us right now."
"I'm filled with lots of emotions, but I really am excited to have this adventure with my little family. I'm embracing the change, so here we go 2023!! Will continue to give updates here, love you all," she concluded.
Witney's announcement served as the caption of a video, which documented Witney and her husband signing a house deed before opening the blue front door of their new big house in Florida and showing off their beautiful screened-in pool and patio.
In the video, Witney wrote, "No one said change was easy, but maybe that's exactly what we need to grow. Embracing our next big adventure together as a family."
Supportive and congratulatory messages poured in for the pro dancer and choreographer.
"So excited wit!!! Wow!!! Congrats," wrote Emma Slater.
"Witttttts!!!!!!!! This is awesome!!! Congratulations! Xo," commented Peta Murgatroyd.
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"I'm so excited to finally announce that Carson, [my son Leo] and myself are expecting Baby No. 2!" Witney shared after taking the dance floor with her celebrity partner Wayne Brady. (They ultimately finished the competition in third place).
"After a really hard 24 hour labor, and an unexpected c-section... we are all healthy and well," Witney captioned a sweet black-and-white photo of her family's hands intertwined at the time.
"We are so grateful & we've been soaking up every moment with our perfect angel boy. Thank you for all the prayers!"
One month after welcoming Leo into the world, Witney told Us Weekly of her delivery, "I pushed for two and a half hours. I was fully dilated and the baby just did not want to come out. He just was, like, stuck underneath my pelvis for so long."
"His heart rate started going really high," she continued. "So we had to do an emergency C-section and obviously, we did whatever was right for the baby."
Witney recalled those turn of events as being "traumatic" because she didn't feel "prepared" for surgery and she was also battling coronavirus at the time.
"I had in my head that I was not going to do that at all," the So You Think You Can Dance ninth-season contestant told Us. "We're just really happy that he's healthy. That's the most important thing."
Witney got engaged to her high-school sweetheart in late 2015 and then the couple got married in Salt Lake City on New Year's Day in 2016. The wedding took place after the pair had been dating for four years.
Witney previously revealed how she "wants a lot of kids" but "four is going to be the [maximum]" for her family.