The 36-year-old took to Instagram on Thursday to share the heart-warming news and several photos of their newborn daughter.
Captioning his post, the fitness influencer proudly wrote: “It’s a girl! Rosie gave birth at 4.32am this morning at home to an 8lb healthy baby in the birthing pool.
“Thank you to Emily & Helen our wonderful midwives who were there every step of the way. Time to rest now. Lots of love the Wicks family.”
Wicks, who is already dad to Indie, three, and two-year-old Marley, first revealed on Wednesday that his other half had gone into labour as he shared a photo of a home birthing pool.
He excitedly declared: “And we’re off! Indie and Marley are asleep upstairs. Could be waking up with a new baby!”
Just a few hours earlier, the social media star’s other half had shared an image of her heavily pregnant frame, and jokingly compared herself to a bowling ball.
However, Wicks couldn’t help but share his awe and admiration for her, remarking: “Just amazes me that there is a human being growing in here. With a little brain, heart and lungs.
“The female body is just an incredible, magnificent creation isn’t it. The ability to create new life. What is more beautiful and special than that.”
The fitness guru recently revealed that he and Rosie have already spoken about their desire to have a fourth child after they welcome their latest addition.
Speaking to OK! Magazine, Wicks said that “they'd like a fourth and possibly more beyond that” and explained that he’s refused to hire a nanny and instead enlists their mums to help out with childcare.
He said: “I’m so lucky as my mum and Rosie’s mum are nearby. I’d find it hard to leave my kids with someone I didn’t know, so the fact I’ve got my mum means I can have a night out in a hotel and I love that.”
On having three kids under five, the fitness coach commented: “I know it’s going to be tough because obviously we’ve got a four-year-old and a two-year-old and so we’ll have to get more people ready for bed. It’s going to be more of a team-like thing.”
Joe and Rosie have been together since 2016, tying the knot in a countryside ceremony in 2019.