The model gave birth to her fourth child while on holiday in Europe with husband Kieran Hayler, after she was taken to hospital when her amniotic sac tore, leaving her unborn child vulnerable to infection.
Little Jett was born several weeks prematurely last month, with Katie telling fans he was having "breathing problems". He had to stay at the hospital in Europe until he gained his strength.
On Tuesday (10 September), however, Katie took to Twitter to tell fans that the trio had actually arrived back in the UK last week, although they kept it secret.
Katie wrote: "It's been a week since me @kieran0322 and Jett been home haven't told people we are home as wanted to settle in! Thank you to all tweets."
While Katie and Kieran's friends and family are no doubt queuing up to meet Jett, two very important people he has already been introduced to are his grandmothers.
Model Katie, aka Jordan, revealed recently she'd flown her mum and Kieran's mum out to visit them in Europe after the pair grew homesick, saying at the time: "No matter how old you are, you always need your mum near when the chips are down."
Katie is also mum to sons Harvey, 11, and eight-year-old Junior, and six-year-old daughter Princess from previous relationships.
Check out some of Katie's looks from over the years: