The 36-year-old star, who was left devastated earlier this year after discovering the part-time stripper had been sleeping with two of her friends, took to her YouGossip account on Tuesday afternoon (05.08.14) to share a picture of Kieran and their second child, who was born on Monday (04.08.14).
She captioned the image: ''Daddy's little girl :)''
Katie - who also has 11-month-old son Jett with Kieran - gave birth to her fifth child on Monday, two weeks before she was booked in to have a Caesarean.
It is not known whether Kieran was present at the birth but in her last interview before she welcomed the little one into the world she revealed he would be there.
When asked whether he would be at the birth, she told OK! magazine: ''Yes. Even if my waters break early then he will be there.''
Earlier this year, Katie took to her Twitter account to reveal she was getting a divorce after discovering Kieran had been having a ''full blown sexual affair'' with her good friend Jane Pountney.
She later found out he had also been cheating on her with her pal Chrissy Thomas, however she has decided to give him another chance and stand by him while he undergoes therapy.
Katie also has children Harvey, 12, from her relationship with Dwight Yorke and Junior, nine and Princess, seven, with ex-husband Peter Andre.
There's already an Oscars buzz surrounding this movie.