Vienna was 18 weeks into her pregnancy when her twin girls "went to Heaven on August 5" as a result of twin-to-twin transfusion syndrome.
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Vienna, 31, shared the news of her devastating loss in an emotional Facebook post on August 13.
"This is the hardest thing I have ever had to write. On Aug 3rd, I went in for an ultra sound bc the Perinatologist noticed one of my twins had more fluids than the other which was the first sign of TTTS (Twin to Twin Transfusion Syndrome) this is when one twin takes more nutrients than the other," wrote Vienna.
"They said that it did look like it had improved over the last week though. Unfortunately, that was not the case and that evening my water broke due to the amniotic sacs rupturing. I spent the next 2 days in the hospital trying everything to save them."
According to her representative, Richard Harlow, Vienna had celebrated a gender reveal on July 30, 2017, only four days before she was admitted to the hospital on August 3 when her water broke.
Vienna continued in her Facebook post at the time: "The doctors had warned me that if I did not go into labor and deliver the babies, I was taking the chance of risking my own life and causing an infection in my uterus but they could not survive at only 18 weeks."
She added, "I was rushed into the OR for emergency surgery and was in the ICU for 4 days."
Vienna said she was "heartbroken" and apparently had "a long and arduous journey to recovery."
"This was the hardest decision I have ever had to make in my life but I knew my little girls were in Heaven already and the pain I feel I would never want any mother to ever feel. RIP My Sweet Angels. Your mommy will never forget you and I loved you both with my entire heart," she concluded.
Vienna never publicly announced the identity of the twins' father.
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 Weekly 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 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 about each other in the press.