"You don't have to put all of it in do you? That's going to be freezing," Katie can be heard pleading at the beginning of the video, before Kieran dumps an entire packet of ice into a large dustbin filled with cold water.
"Let me feel that. Jesus Christ that's going to kill me!" the mum-of-five squeals.
Katie, 36, stands shivering in her garden as Kieran climbs on a wall and gleefully tips the contents of the dustbin over her head.
Katie then uploaded a second video of her running around in her drenched top and shorts.
Katie was nominated to complete the charity challenge by Rylan Clark.