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The TV personality— who also starred in I'm A Celeb... Get Me Out Of Here!— announced on Instagram that he and his girlfriend Anita Barone are expecting their first child together!
"LIFE! I can't believe this is happening but it's the best news to hear and I am very excited to share with you all that I'm going to be a daddy," he wrote alongside an image of the ultrasound and a selfie of the couple.
"Here's to celebrating my last year of my twenties and becoming a daddy in 2020."
"I can't believe this is happening."
The couple sparked dating rumours in May
The unexpected news was met with a flurry of congratulatory messages, with many of the model's on-screen co-stars wishing the couple well.
"Yayyyyy you're going to be an amazing dad! What a lucky little bub!" wrote Love Island's Millie Fuller, while Tayla Damir added: Yay finally! Secrets kill me 😂 so happy for you boo! You are going to be such an amazing dad ❤😍 can't wait to spoil the little munchkin"
"Congrats! So incredible!!❤" wrote The Bold and The Beautiful's Katherine Kelly Land, who also appeared on Justin's season of I'm a Celeb.
The announcement comes months after they began dating.
After sparking romance rumours with Anita in May, Justin— who's steered clear of the spotlight after exiting the jungle— confirmed he was off the market one month later, sharing a photo of the couple kissing with the caption: "I can't stop falling in love with you."
Moments later, he uploaded another snap with his girlfriend, writing: "Love, I hope you find it and feel it and hold onto it forever and ever."