The glamour model entered the Australian jungle in an animal print swimsuit and wasted no time putting her surgically enhanced assets on show in a water-based challenge.
But the 31-year-old faces some stiff competition in the form of busty Kim Woodburn, 67, who has already drawn attention to her naturally large chest on several occasions.
The How Clean Is Your House? star proved she was no shrinking violet as she stripped naked and scrubbed down in the river following her bushtucker trial.
She also berated host Dec following the challenge, which saw her win all 11 stars after being submerged underwater in a tank full of bugs, telling him to stop ogling her bosoms.
Mother-of-three Katie made a Lara Croft-style return to the camp, which saw her overcome her fear of water to earn treats for her new camp mates.