While the 44-year-old also opted for eagle wings to cover both thighs, sprawling all the way to her knees.
The horse tattoo featured a stallion in action galloping as it was finished off with a floral design as it took up almost all of her stomach.
While her thigh inking’s were also embellished with flowers, with one sitting below an existing garter-style inking that graces Katie’s upper right thigh.
The impressively large new body art joins a slew of others on the TV personality’s arms and legs – including a portrait of beau Carl Woods’ face.
They appeared healed and uncovered as Katie proudly stepped out in the pink and yellow patterned bikini, paired with a matching sarong.
She added a matching hairband to complete the outfit, alongside a pair of khaki sliders.
Katie’s complexion was left natural, as she shielded her eyes with a pair of gold sunglasses.
While she pulled her highlighted tresses away into a low bun – sipping on a bottle of water to keep cool.
She strolled in the sunshine of Koh Samui during the final day of her holiday – before jetting back to the UK after three weeks.
Soaking up the sun, Katie stood on top of an outdoor sun lounger while stretching up, before leaning back to relax.
She then moved over to a hammock chair, making herself comfortable as she swung back and forth.
It comes after the ex-model announced she is temporarily quitting social media, saying she needs to ‘take time off’.
Sharing a statement on her Instagram on Thursday, Katie wrote: ‘I will be coming off all social media for a period of time. I need to take time off for personal reasons.