The TV favourite and her boyfriend Adam Crofts reportedly welcomed the new addition last week, The Mirror have reported.
Tina O'Brien has given birth to her second child
A source close to the star revealed: "Tina and Adam are over the moon with their new arrival. They are a really down-to-earth couple and everyone in the area is delighted for them."
Tina, 31, has been dating Adam Crofts, who is a personal trainer, for three years.The couple were brought together by the actress' five-year-old daughter Scarlett, whose father is Ryan Thomas, another Corrie star.
The couple are yet to reveal the baby's name
Tina told Reveal magazine: "I remember walking in (to a coffee shop) with Scarlett and she spotted this guy sitting at a table with a laptop.
"She's so chatty and went over to say, 'Hello, man!' I was about to tell her not to talk to strangers, when I looked at him. It turned out he was seriously fit! I thought, 'Good choice, Scarlett,' and asked his name.
"It's funny because I really wasn't looking for a boyfriend at the time, but we got on so well and he asked me out properly a few weeks later. So Scarlett was basically my matchmaker."