Dan announced his exciting news on Twitter, telling fans that his unnamed newborn son is "perfect" and "just amazing".
The reality star revealed last night (22 December): "SOOO happy to let you all know that our little baby boy was born this morning!
"He's perfect! Love him more than anything!! :) x"
After being bombarded with messages of congratulations, Dan added: "Thank you ALL soooo much for your tweets about my little boy, appreciate every single tweet.
"He's just amazing! Unbelievable feeling xx"
SOOO happy to let you all know that our little baby boy was born this morning!..He's perfect! Love him more than anything!! :) x— Daniel Osborne (@DannyO) December 22, 2013
TOWIE star Dan revealed he was expecting a baby with his ex-girlfriend Megan in August.
At the time, he was seeing Lucy Mecklenburgh, however she called time on their romance after learning about his baby news.
Since then, Dan briefly dated EastEnders star Jacqueline Jossa but he is now single and looking forward to being a hands-on dad.
Dan recently told Reveal: "I'm single at the moment, I'm focusing on my role as a dad. Let's just say I'll be avoiding the mistletoe this Christmas!"
Aww, congrats Dan!
Dan was Reveal's Stripping Santa this year - check out the pictures below: