Katie welcomed her second child with cheating husband Kieran Hayler – a daughter – on August 4.
She has not shared her daughter's name, weight or any proper photos, but has taken to Twitter to show off her post-baby body.
In a series of photos on YouGossip, Katie showed off her flat stomach in a vest and neon lacy pants (as you do). She was immediately criticised on Twitter (naturally), with fans accusing her of trying to 'prove' something.
Prior to the pics, Katie shared her thoughts on her body in her Now magazine column, writing: "I will have lumps and bumps in places - it's natural after giving birth.
"My body's had to grow two babies in just under a year and, like all my children when newborn, they're my priority, not my body."
And, true to form, Katie followed her tummy pics with a black and white photo of herself holding her new daughter – and we were treated to the top of the little girl's head!
Katie accompanied the photo with the caption: "So in love with my runner bean she is tiny perfect and my miracle."
The as yet un-named daughter is Katie's fifth child - and her second with Kieran. Katie gave birth to Jett a year ago, and Katie is also mum to Harvey, 12, Junior, nine, and Princess, seven, her two children with Peter Andre.