"It was a lot and it was just a late night and no one was in their best state," the country music star confessed.

Got a confidential news tip? We want to hear from you. Sign up for free newsletters and get more CNBC delivered to your inbox Get this delivered to your inbox, and ...

For many businesses, interviews are conducted during the hiring process or when someone leaves the company. However, there are also benefits to interviewing employees at various points in between.