"I'm so happy. It's a boy!" Karine gushed in the video, showing off blue balloons in the background.
"We're happily expecting a lovely baby boy," Paul added.
Paul said the baby is "healthy" and "extremely active," as he is "bouncing around" and "really hyper."
"I was really hoping for a baby boy because I wanted to make sure my last name would be carried on," Paul shared.
"[Karine] wants black hair, blue eyes and [her] skin [for the baby]. We are working as a very happy unit. Communication is better, language is better. I've done a lot of work on my Portuguese and Karine is doing very well with her English."
While fans witnessed Karine having a miscarriage on Season 2 of 90 Day Fiance: Before the 90 Days on TLC, Paul admitted to Us Weekly his wife actually suffered multiple miscarriages.
"We were supposed to wait six months to a year. So, we were going to wait, give it time in regards to that," Paul explained.
"We've actually heard things where if we had the baby within six months it's actually better. I was like, 'Okay, whenever you're ready.' She got pregnant within a few months. She was in denial."
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Paul said it's been an "intense" time in their lives, but now they are excited for the baby and planning for his arrival.
In fact, Karine has already reportedly picked out a name. However, Paul admitted he can't pronounce the name and he's not a fan of it at all.
"The initials I don't like. The initials she wants are 'PMS.' She doesn't get why it's bad," Paul told Us, adding that he hopes Karine will change her mind about the name. "It's not going to be good. I was bullied all my life. It's not good initials."
For the time being, the couple is living in Brazil, but Paul revealed Karine "wants to relocate" to the United States soon.
Paul and Karine were shown going through many ups and downs on 90 Day Fiance: Before the 90 Days -- including Karine threatening to divorce her husband shortly after saying "I do" -- but the pregnancy has apparently brought them closer together.