When she couldn't stop changing her hair hue
It's all too easy to catch a secret agent on a mission if they don't change up their appearance as often as possible. That'll explain why she's flirted with the blonde look many times. During her divorce to Kris Humphries, Kim went a little overboard when she stocks up her wig collection until her family intervened and hinted she might have multiple personalities. They probably didn't know it's all handy when you're living that secret agent life.