The former `Dawson`s Creek` star is currently single but hasn`t ruled out having a sibling for her six-year-old daughter Suri - whose father is the actress` ex-husband Tom Cruise - in the future.
Asked if she wants more kids, she said: "I don`t know. I`m open to it."
It was recently claimed the brunette star was considering a career change to become a lawyer, and she hinted it could be a realistic option for her.
She said: "Well, my brother and father are attorneys, and ... we`ll see. I like the practical thinking of attorneys."
The 34-year-old screen beauty tries her best to be nice to people at all times following some advice she was given by her mother when she was younger.
She explained to the forthcoming April edition of Allure magazine: "[The advice was] `You may be pretty, and you may be talented, but nobody will remember that if you`re mean.` "
Though Katie`s last acting venture, the Broadway play `Dead Accounts`, was cancelled before the end of its run, she is still happy to have been part of the production because she was so determined to return to theatre work.
She said: "I was open to - well, to whoever wanted me. But it was always my goal to make it back to the stage."