The former glamour model's rep announced that she had welcomed her fifth child today (4 August), a daughter, who has yet to be named.
In a tweet, she said: "[We] can confirm that our client @MissKatiePrice has given birth to a baby girl this afternoon - no more details will be given at present."
Speculation that the baby was coming any day now was sparked last Tuesday when Katie, 36, missed her weekly Fubar Radio show for the first time, with her rep saying she was feeling a bit poorly.
On 22 July, the star had said of her rumoured 15 August due date: "I've got a date that I'm booked in for a C-Section that's a few weeks away, but because of an operation I had a few weeks ago it could happen anytime. Each pregnancy I've had has been completely different. I should be on bed rest but I'm just too busy."
This is Katie's second child with estranged husband Kieran Hayler.
Their first child, son Jett, was born last summer.
Katie's baby news will bring plenty of joy to her life in a difficult time after it was revealed in May that Kieran had embarked on an affair with her best friend Jane Pountney.
Initially, heartbroken Katie vowed to divorce Kieran, 27, but in recent weeks it appears she is beginning to thaw towards him and hasn't pulled the plug on her marriage just yet.
She told her radio show of Kieran's cheating: "If it happened again, absolutely he would be gone. I would never have wasted my time and effort if I thought deep down he was greedy and wanted sex elsewhere. I know about his past, there's lots of elements to it."
"What upsets me most is that I knew something was going on," she said. "I just couldn't put my finger on it. People would just tell me, 'Kate, it is your hormones'.
Kieran's infidelity was revealed just days after Katie discovered she was pregnant with her fifth child. She accused Kieran of starting the affair shortly before the birth of their son Jett, which happened in Europe last summer.
Katie had been hospitalised in France following pains, and she says Kieran and Jane began their sexual relationship at the holiday villa while she was in hospital.
So far, it hasn't been confirmed whether or not Kieran was by Katie's side, although it was reported in May that she wanted him in the delivery suite with her.
Celebrities who have welcomed babies in 2014:
Copyright: Rex Features WENN/Matthew Taylor/Daniel Deme/Josiah True/Matthre Taylor/Joe
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