The January issue of Cosmopolitan (UK) goes on sale this week and the first edition of 2012 features Katherine on the cover.

Interviewed inside the magazine, she reveals how she's gone from childhood tragedy to the strong, successful woman she is today and opens up about her thoughts on love at first sight, and what she'd do if her husband Josh Kelley ever cheated.

Katherine explains, "I've been debating this lately. Josh and I always said that cheating would be a deal breaker; there is no second chance. But I've seen friends and acquaintances go through it and they've found a way back to the relationship, and a way to forgive each other. And as much as I would kill him if he cheated because it would destroy me, I have started to question whether, if a mistake were to be made and it was a one-time thing, I would forgive him. Because look at the life we've built together. We have history, we have a child... But at the same time, it would be really hard to ever fully trust that person again."

Katherine Heigl Cosmopolitan (UK) January 2012

Check out for more including a feature looking at Katherine's style evolution. The full interview and photo shoot from the magazine is available in stores from Thursday, December 8.