Joe Swash, 37, shared a post of Stacey Solomon, 29, in hospital with their new tot, revealing their newborn has arrived “earlier than planned”.
In view of her one million followers, he wrote: “This morning. A lot earlier than planned I watched the love of my life, bring a new life into the world.
“We are overwhelmed, overjoyed and apprehensive of what’s to come. Mummy and baby are well and resting.
“We are so grateful for all of the love, support and positivity we’ve received over the last 8 months. I’m lost for words to describe how I’m feeling.
“So for now, I’m going to spend the next few days and the rest of my life falling more in love with these two humans.
“I didn’t think it possible but, today I witnessed the impossible.
“My partner, My love, my life, you are a super human. I am forever in awe. Joe X”
Joe also shared the post with his 731,000 followers issuing the same statement.
Following the news, many of the pair’s showbiz friends and fans flocked to the post to congratulate them.
Ruth Langsford commented: “Congratulations love birds! SO happy for you both!”
Ashley Roberts: “Love to you and your family.”
Earlier this month, Stacey gave her social media fans an insight into her surprise baby shower.
The former X Factor star beamed as she cradled her blossoming bump in a figure-hugging bardot dress.
Stacey also shared pictures of her beaming in front of blue and purple decorations including a balloon arch and flower wall.
Back in February, Joe announced the pair are expecting their first child together.
He shared a picture of Stacey asleep on his Instagram page with the caption: “Have been driving myself mad thinking that she’s bored senseless of me and can’t stand to be awake for longer than 10 minutes of my company…
“So you can imagine my delight to find out that she still loves me and my company very much she’s just been growing a baby.
“I can’t begin to describe how happy we are to be able to share this wonderful news.
“We’ve been so blessed with 3 incredible children that we’ve had the privilege of raising and we are forever grateful to have the chance to become parents to another wonderful child.
“It’s all very overwhelming and emotional and we couldn’t be happier right now.”
Stacey is also a parent to sons Leighton, seven, and 11-year-old Zachary from previous relationships.
Joe has an 11-year-old son named Harry with an ex partner.