Kelly Clarkson's whole world has been turned upside down with the loss of her ex-husband, Brandon Blackstock. As you know, news broke on Thursday that the 48-year-old talent manager died following a private three-year battle with cancer. The news came as a shock to everyone since "only a few people" in Kelly's circle knew about the health battle, but it explains so much about what has been going on with her lately. Over the past year, the singer abruptly missed several episodes of The Kelly Clarkson Show and concerts. She gave no explanation for her absences... until earlier this week.