"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 the ballroom audience cheered and clapped, Witney continued, "So, I'm so blessed, and this just felt like a really, really good time to share it! And I can finally share it, which is great!"
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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."
"Baby McAllister coming Jan 2021!!!!! We can't even contain our excitement and joy right now," Witney wrote alongside a photo of herself embracing her husband while holding sonogram photos and a positive digital pregnancy test.
Witney said finding out she was pregnant for the first time felt "surreal and special!"
"We love this little bean so much already and we can't wait to start this beautiful chapter in our lives! #15weekspregnant #mcallisterbaby," she added.
Witney then announced in August 2020 she had a baby boy on the way. She and Carson discovered the baby's sex at a big gender reveal party.
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.
The pro dancer and choreographer previously revealed how she "wants a lot of kids" but "four is going to be the [maximum]" for her family.