The 28-year-old socialite said she is determined to have the baby without medical aid, even though she knows it will be painful, reported MTV online.
"I'm so ready. I've decided that I'm going to have an all-natural water birth. No medicine. I want those bragging rights! The next time Wiz has a stomach ache or anything, I'll say, 'I popped out a baby all-natural'," she said.
Rose, who is in her second trimester, said she is not worried that the child will affect her modelling career.
"We're having a baby so that's more important to me than any career I could possibly have," she added.
The couple are waiting until after their son or daughter is born before resuming the plan of their wedding.