The `Grey`s Anatomy` actress - who has 17-month-old adopted daughter Naleigh with her spouse Josh Kelley - says her three-month career break was the longest she had spent with the musician since they first started dating five years ago and admits she occasionally felt the strain.
She joked: "There were a good few weeks when I almost smothered him with his pillow. But that`s marriage, two people with totally different lives and totally different experiences just trying to fit."
Shortly after adopting Naleigh, Katherine - who married Josh in December 2007 - worked on movie `Life As We Know It` and claims it "broke her heart" to have to act alongside children who weren`t her daughter.
She told America`s Harper`s Bazaar magazine: "It was crazy, because as my character was learning how to take care of a one-year-old, I was too. But as I was working with these gorgeous little triplets who play my child, I was feeling bad that I was spending more time with them than with my own kid. And that broke my heart."
The 31-year-old star thinks she is now ready to grow up and hopes she can finally get herself to a position where she stops worrying about her mistakes.
She added: "Now it`s time to re-evaluate and grow up. I hope by my mid-30s, I get to the point where I don`t doubt myself. I`m going to make mistakes and say stupid things, but I won`t have to sit in a room in the dark and wonder, `Am I a bad person?` It will be `OK, Katie, enough with the drama.` "
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