Take Me Out presenter Paddy announced the news that Christine had given birth, confirming they have called their daughter Felicity.
Paddy tweeted a cute picture message, which read: "Felicity Rose McGuinness. 09-09-16. 8lb 2oz."
Alongside it, he added: "Welcome Felicity! The boys are officially out numbered in our house. Let the maternity see the leave!
"Thank you to all the Drs, nurses, wonderful maternity staff and the amazing team in NICU at St Marys hospital who helped our baby girl."
Paddy, who already has a son and daughter with Christine, has since given fans updates on having a newborn in the house again.
"My first night of no sleep done," he revealed. "Only another two or three years to go! Nothing us parents can't handle. Now where did I put those Pro Plus?"
Paddy has been inundated with well-wishes from fans and he has replied to several of them. When one told him she is expecting twins, he said: Ouch! Good luck!"
Responding to another who had asked for tips, Paddy joked: "A little cry now and again!" And when one follower also spoke of the woes of a non-sleeping child, he told them: "We managed to get ours sleeping through but now we're back to square one!"
Follow us on Twitter @RevealMag for all your celeb, fashion and beauty news!