Published Monday, 23 December 2013
The 35-year-old told fans on Twitter last week that she was feeling unwell, and went on to reveal on Sunday that she was in hospital on an intravenous drip.
She wrote: "Still soo poorly problem getting worse no meds are helping such s*** times. Great in hospital on a drip."
Katie later revealed she had been discharged, but failed to reveal her condition.
The star has had a tough year health wise - she underwent emergency surgery in September after suffering complications following the birth of her fourth child, son Jett Riviera, in August.