The British star increasingly vulnerable when making public appearances and has stopped being as accessible to her admirers.
Speaking at the signing of her new novel `Paradise` at a HMV store in London onn 28.07.10, she said: "I always used to do pictures for fans in front of the signing table but I don`t do that any more. I have changed everything. I feel safer sitting behind the table now.
"It ruins it because it now means you can`t do pictures with the fans. But you never know if they`ve got a knife or something. I don`t want to get hurt. I`ve got the best security, I just have to be more careful these days."
In the past two weeks, Katie was booed by the crowd when she performed her single `Free To Love Again` at a nightclub in Southend, Essex, and was also jeered when she accompanied husband Alex Reid to a cage fight in Portsmouth.
Katie fears she could suffer the same fate as `Bleeding Love` singer Leona Lewis, who was attacked by a fan last year while promoting her autobiography `Dreams`.
The 32-year-old star - whose ex-husband is Peter Andre - said: "It`s a shame when something like the Leona Lewis incident happens."