Katie posted this family photo on YouGossip, showing Jett having a birthday cuddle with his dad, Kieran. Katie looks on proudly, looking uber glam despite having a newborn at home (she'd be forgiven for being in a dressing gown, but that's definitely not her style).
One-year-old Jett was presented with presents and a jet-shaped caked made by Kieran's mum.
Katie captioned the photo of herself with Jett and Kieran: 'Capturing the moment'.
The couple are yet to release the name or photographs of their new baby daughter, who was born on August 4, several weeks premature.
Over the weekend, Katie teased fans with a black and white photograph of a newborn baby with the caption, 'soooo cute'.
Her fans quickly took to the comments' section to gush about how much her newborn looked like her older daughter, Princess, but they were left red-faced when it turned out it wasn't Katie's daughter at all – just a lovely piccie of a new arrival from the internet.
What a tease!
Katie's actual new baby was premature, just like older brother Jett – and certainly was a surprise baby. Katie and Kieran only discovered they were expecting their second child together (and Katie's fifth) six months into the pregnancy.
Shortly after announcing their news, Katie discovered Kieran had been cheating on her with her best friend Jane Pountney. Kieran moved out, then moved back in, and apparently was at the birth of his daughter.
The photos from Jett's birthday bash seem to imply the couple are back on track. Katie recently said Kieran was being treated for sex addiction (yes, really), and that the pair were taking each day as it comes and working on their marriage.
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