Julio Pena and his wife Kari are the proud parents of four daughters, and were wanting the gender of their next baby to be a complete surprise. For the "gender reveal" party, the couple asked the doctor to seal the ultrasound results in an envelope - the couple then gave the envelope to their 17-year-old daughter, Chastity.

Chastity was responsible for ordering a colored cake (frosted in white) for the party. The cake's color would represent the sex of the baby - pink if it was a girl, or blue for a boy.

The hour of revelation

Surrounded by family and friends, it was finally time for the family to know if they were expecting daughter number five, or if they were finally having a boy. The parents-to-be were very anxious, especially Julio.

Momma Kari starts cutting the cake and gets a peek at the color inside before her anxious husband does - but when he saw the results for himself, he went into complete shock - the filling was blue! He was finally getting a son. In all the hollering and excitement, Julio collapsed behind the table.

He told ABC News, "It was like I collapsed and fainted at the same time."

The viral YouTube video

Friends and family rushed to help him off the ground; the father seemed OK, just completely shocked and thrilled. "I've been waiting for this for a long time. For a boy ... they had to sit me down in the sofa and I couldn't say anything. I was like in shock." Julio said in an interview with ABC News.

Kari said her husband was already shaking before they cut the cake, and he was so nervous to find out what they were having.

Their hilariously adorable video went viral with over 2.5 million views - certainly a warm welcome to the newest addition to the Pena family. Their baby boy was born June 2016 to a very excited family. Congratulations to the darling Pena family!

This article was adapted and translated from the original "Pai de 4 filhas desmaia ao descobrir o sexo do novo bebê que estava a caminho" which was originally published on familia.com.br.