The former glamour model gave birth to her fifth child, a daughter who has yet to be named, on Monday 4 August.
Last night, she shared a photo on her YouGossip page showing her little one's car seat. "Woo hoo!" she told fans. "Here we go! Loving her new car seat."
Katie, 36, has yet to show us a proper picture of her new arrival, although she gave us a glimpse earlier this week when she posted an image of the baby's tiny hand curling around her husband Kieran Hayler's finger.
It's thought that Kieran was by Katie's side during the birth, as she appears to be giving him a second chance following the news he cheated on her.
Katie was heartbroken to discover Kieran's affair with her best friend. Even worse, the news broke just days after she'd discovered she was pregnant with their second child.
Devastated Katie vowed to divorce Kieran at first, but as time went on she thawed towards him. She has, however, warned that if he ever cheats again she will kick him out.
"If it happened again, absolutely he would be gone," she said on Fubar Radio. "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."
Katie and Kieran are also parents to son Jett, born last year. Katie has three other children – Harvey, Junior and Princess – from previous relationships.
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