The `New Year`s Eve` actress - who raises three-year-old adopted daughter Naleigh with husband Josh Kelley - admitted she used to want a huge brood of six kids, but she has since decided to cut back on her dreams of an ideal family.
Speaking on `The Ellen DeGeneres Show`, she said: "I used to want like six kids. Now we`re thinking maybe like three to four kids. That would be my ideal. That`s still a lot, isn`t it?"
The 33-year-old star has previously explained she was "surprised" to discover her husband is such a "great dad", as she wasn`t prepared for how well the musician would cope with being responsible for someone else.
Katherine said: "He`s a great dad. I didn`t expect it.
"He`s such a guy. I adore him, I can`t imagine being with another man, but he can be very self-absorbed. Not in an egomaniacal way, just kind of in his own head and unfocused on anything other than his own stuff. So I was really surprised by how on top of it and how connected he is."