New dad alert!

Theo Campbell — known for stints on MTV's The Challenge and the U.K.'s Love Island — became a father Sunday when his new addition, son Aries Campbell, entered into the world, he revealed on Instagram Monday. Sharing a photo of himself holding the baby in a carrier, Campbell explains why he kept the pregnancy news a secret.

"Dam, my replacement is here 👶🏽 – 21 hours later and he's here 🎉 I can't believe the joy I had looking into the eyes of my baby boy ❤️," he writes. "I only told a few friends and family so for most people will be massive surprise seeing this 😄 Over the past 4 years having a private life isn't really a thing so being able to keep this private has been so nice."

Though he didn't tag anyone or name the new mom, Campbell applauded her, saying: "Massive well done to his mum as-well, the process of having a baby is crazy I literally didn't have a clue how strong a woman has to be to go through this!"

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A rep for Campbell did not immediately respond to PEOPLE's request for further comment.

On her own Instagram page, influencer Sapphire Yhnell shared a pic of the baby boy cozy in the same bear onesie, writing, "My beautiful boy – Aries 🐻." Both Campbell and Yhnell shared videos on their Instagram Stories from inside the hospital, including one clip from an ultrasound check-in.

Campbell was forced to sit out The Challenge season 35 after a champagne cork incident left him partially blind in his right eye in 2019. The War of the Worlds 2 competitor offered an update on his eye in December, writing: "You find out how much strength you really have when you're thrown off the edge and manage pull yourself back up, always keep it moving."

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