In an interview with Parade at the "Killers" press junket to promote the June 4th release of the action comedy, Katherine explained why she didn't think she would make a good secret agent.

Katherine Heigl: Why My Husband Stopped Listening To Me

By Jenny Wolf

"I'd be a terrible secret agent. I can't keep a secret and I'm not sneaky. Though I have to say I am very good at hiding. I can hide, and my husband's just terrible at finding me. I do like to jump out from behind doors and scare him."

Katherine Heigl surprised Grey's Anatomy fans with a sudden departure from the hit series, but she's keeping busy on the big screen. In Killers, Heigl takes on her first action role opposite Ashton Kutcher. After she discovers his secret life as a government assassin, she ends up joining him to take out some bad guys from his past.

In real-life, however, Heigl is much too upfront to go undercover.

"There are some things that if you say them out loud it will hurt the other person's feelings," Katherine says. "I tend to say them anyway because I think it's better to be honest. I gave Josh [husband Josh Kelley] a really hard time recently because he got this new haircut for a photo on the country album he's releasing. I really didn't like it, even though everybody else loved it. I was like, 'You don't look like you. You're really sexy, you're a manly man and this is kind of a metrosexual look.' Finally, he just stopped listening to me."

Ashton was honest with her.

"He was really mad at me because I wouldn't do my own stunts. He was only partly joking when he said that I probably even think running is a stunt. Actually, I do, because it's dangerous. I have bad feet and I have weak ankles. If you have to do it over and over again, you can hurt yourself. Anyway, Ashton was always just rolling his eyes at me."

At least she's feeling confident as a mom.

"It could all turn to crap when my daughter turns 13 or something. But, I think as of right now, we are so into it and confident as parents like, 'We're in charge.' We're the cliché, typical couple who's talking about poopie diapers and stuff. We're always communicating about those more than we probably talk about anything else. I know we'll eventually chill out."

What she can't get right.

"I keep kind of making certain mistakes in public appearances over and over again. I was on Letterman the other night, and I always choose a dress that's impossible to sit in. It looks great standing, but then you sit and you are like, 'Oh, my God. All my cellulite is showing.' So you have to sit like a statue. I keep forgetting the lesson I learned: just wear pants."