The former glamour model insisted two speeding offenses were not carried out by her as she is "obsessed" with her pink Range Rover and her partner is the sole user of the white vehicle caught on camera travelling through London too quickly on September 5 and 6.
She told Bromley Magistrates Court on 31.08.12: "We checked it out and we saw it was the white Range Rover and I said, `Oh well, it definitely wasn`t me, because I have got the pink one and I always drive my pink Range Rover.`
"I have got three other cars that I don`t really drive, they`re just on the driveway.
"There`s other people insured on them if they want to drive them.
"I know on the Monday that Leo, my other half, took his family, because they were visiting from Argentina, to London and got back late because his sister`s boyfriend got mugged in the pub, and on the Tuesday morning it was the kids` first day at school.
"I know it was Leo, he was the only one who drove that car, he didn`t have another car to drive.
"Because I got my pink car that year, I am obsessed with driving my pink car."
Katie claimed she failed to see two speeding tickets which were sent to her because she doesn`t open her own mail, and she only became aware of the incidents when she was sent a court summons in April or May this year.
She added: "My mum does the post, she checks it all. Well, she opens my post.
"Anything that needs to go to the management, she pays my bills, she-s got my chequebook, she does everything for me - I know that sounds bad."
The 34-year-old beauty - who has children Harvey, 10, Junior, seven, and Princess, five, from previous relationships - was found guilty of two counts of failing to give information regarding a driver`s identity as required.
Katie - who had six penalty points on her licence - was given an additional six points and subsequently bannedfromdriving for 12 months.
She was also ordered to pay a £400 fine along with £350 costs and a victim surcharge of £15.