The `Batman Begins` actress - who has five-year-old daughter Suri with husband Tom Cruise - loves to move to music, even when she is engrossed in everyday tasks such as cooking and running errands.
She said: "In my kitchen, a lot of times, I practice. I do dance in my car. In fact - I`ve gotten caught before.
"But it doesn`t stop me because I think, `You know what? I like to do it.` And when I see other people do it, I`m like, `That`s right, enjoy it!`"
Despite the fact she dances behind the wheel, Katie maintains she is always safe, as her moves are "all upper body," but when she is driving smaller cars, the 5` 9" tall star admits she sometimes has to pull her leg up to stop getting cramp.
Speaking on TV show `Late Night with Jimmy Fallon`, she added: "Well, there are certain cars that are tiny and sometimes my leg gets cramped so I [put my leg up on the seat] and just use the right foot [for the pedal]. That`s not illegal!"
While she is always a safe driver, Katie, 32, had a narrow escape from a burning car while filming `Don`t Be Afraid of the Dark` in 2009, after a battery used in it blew up on set, causing it to fill with smoke and fumes.
The actress managed to run from the car and no one was harmed in the accident.