The mother-of-five was appearing at court in relation to the accusation she jumped a red light while travelling on a road near her home in August last year.
According to local newspaper The Chichester Observer, the 37-year-old changed her plea from not guilty to guilty during today's court appearance and was given a fine.
The newspaper says Katie's lawyer told the court the incident had happened following the birth of Katie and Kieran's daughter Bunny, who arrived via an emergency Caeserean, and while they were moving house: "So two very difficult, and incredibly stressful things going on in her life at the time."
Katie had three penalty points added to her driver's licence and was fined £700, plus £450 costs and a £70 victim surcharge.
The model and businesswoman made no mention of her court appearance on Twitter today.
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