YOUNG HOLLYWOOD TV
Heigl also fears she was so "completely bonkers" that her work on the movie may have suffered.
She says, "Most of filming new movie Life As We Know It was a blur. I had just become a mom. I still don't necessarily always know what I am doing, and I certainly didn't then.
"I was all over the place. I was really trying too hard. I was completely bonkers. If I spread myself too thin, I'm not a good actor, I'm not a good mother, and I'm just really high-strung. Then everybody hates me."
Heigl stars alongside Josh Duhamel in the comedy, about two acquaintances who are forced to raise their mutual friends' baby when they are killed in a sudden car accident.