Vienna, who won the heart of Jake Pavelka on The Bachelor: On the Wings of Love, is expecting identical twin girls, who are due this winter, Us Weekly reported.
Vienna, 31, "started bawling" when she learned she's pregnant with twins, and the moment she found out about their gender was just as magical.
"I thought there was a good chance of [twins] because there are five sets of twins in my family. Truth be told, and this is crazy, but I've always wanted twins. Finding out that I was having them was one of the most amazing moments of my life. They'll have a built-in bestie for life," Vienna explained.
"Honestly, I wanted girls. I thought they were boys until I started picking out nurseries. I put pictures side by side and I looked at them and realized I picked out seven girl nurseries! It was psychological."
The Orlando-based architectural and engineering recruiter, who announced the pregnancy in June, revealed that she has four baby names already picked out.
"Now that I know they're girls, I'll say the names out loud like I'm talking to them and figure out what sounds best," Vienna said.
The former reality TV star couldn't be more thrilled about her children on the way, but she told Us she has a "high-risk pregnancy."
"The twins are monochorionic diamniotic. They share a placenta, which means they also share nutrients. One baby can potentially take more from the other, so I have monitoring every two weeks. The moment doctors see one growing bigger, there's a surgery they can do," Vienna disclosed to the magazine.
Although Vienna's first trimester was "really difficult" because she "had no appetite at all," she said she's doing prenatal yoga and craving some strange food items now.
"Peaches and pickled eggs," Vienna shared. "It's a redneck thing! And Coca-Cola from the glass bottle. That sounds picky, but it tastes so good."
Vienna has yet to identify the twins' father, but she apparently has an awesome support system behind her when they arrive.
"Three of my cousins and two of my best friends are pregnant right now. It's nice because our kids are going to grow up together -- and I get maternity clothes passed down. My mom is going to live with me for the first two months to help with the babies," she told Us.
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Vienna said she can't wait to take her girls to Disneyland and the beach for the first time.
"With kids, it's all new and exciting. And I'm really excited to dress them up. Isn't the best part of having twins dressing them in matching clothes?" she gushed.
As for what's next for Vienna career-wise, she wouldn't be opposed to doing more reality TV.
"I've been asked to do Bachelor in Paradise and Famously Single and I've said no. I've enjoyed life out of the spotlight. But I've been approached to do a docu-series about my life and raising twins. I've been thinking about it, as long as it's not about the drama and ratings," Vienna explained.
She also wouldn't mind if her daughters star on a reality TV show one day, as long as they are looking for a fun experience, friendships and travel opportunities -- not because they think they are going to fall in love.
Vienna was previously engaged to NASCAR driver Todd Allen, whom she dated for three years prior to his August 2016 marriage proposal. However the pair broke off their engagement and split only a few months later in November, Us reported at the time.
"If he's stupid enough to walk away, be smart enough to let him go," Vienna captioned a November Instagram photo of herself out with a girlfriend.
Vienna was known as the villain from Jake's The Bachelor: On the Wings of Love, The Bachelor's 14th season, because she clashed with most of the women in the house.
The couple had called off their engagement in June 2010, just three months after the finale aired on ABC. Their split was very volatile, as both individuals made unflattering accusations and claims to the press about each other.
Shortly after her breakup with Jake, Vienna began dating sixth-seasonThe Bachelorette contestant Kasey Kahl. The couple, along with Jake, all appeared on Bachelor Pad's second season together in 2011, which sparked endless drama.