The TV presenter, 31, is famous for hosting C4's Bodyshockers where she meets people who are planning to undergo major body modifications - including those planning to have or remove tattoos.
And now, Katie has revealed she is attempting to erase her own body ink.
Taking to her official Instagram account on Saturday (22 November), petite Katie shared a photo of herself after her first session of laser tattoo removal.
And while the tatt is still very much visible, fans couldn't help but notice Katie's tiny waist and super-flat stomach.
As her fans commented on the picture of Katie lifting her top to reveal the tattoo on her hip bone, one wrote: "Katie is #fitspiration NOT thinspiration!! There is a huge difference."
Another described mum-of-one Katie as "amazing", while one lady said: "Katie how is your stomach so flat after having a baby?"
Alongside the snap, Katie said: "So I had my first session of laser tattoo removal on Sunday - I won't tell you how it felt as I made it quite clear on camera #BodyShockers but here are my results tonight day 6 after procedure! #proskinclinic."
Katie, who gave birth to first daughter Belle in March, also shared a photo of herself enjoying a very healthy breakfast...
While some of us start Sunday with a bacon sandwich, Katie enjoyed wholemeal toast with low fat cottage cheese, and coffee with no milk and no sugar! So, that's why her tummy is so enviably flat!
The author, whose face was burnt in an acid attack in March 2008, is currently filming a new series of Bodyshockers - and made sure she looked gorgeous on set over the weekend.
Sharing a picture of herself in a white polo neck jumper and jeans, she wrote: "My outfit for today's @Bodyshockers filming is Jacket and Boots @oasisfashion Jumper @missselfridgepr Jeans @topshop."
The motivational star also posted an uplifting message to her fans, saying: "Woke up this morning knowing that I'm healthy, happy and in love! The three reason to love life :)."
A lesson in being positive, thank you Katie!
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See the other celebs like Katie who have welcomed babies in 2014:
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