Kelly Clarkson surprised her audience in Detroit by belting out Eminem's hit song "Lose Yourself."

The American Idol winner told the crowd:

    “Is anyone an Eminem fan? I am an Emimen fan as well; I grew up listening to him as well. But the difference is, people, when you listen to him on the radio and sing along to him in your car, you're a lot more bad-[expletive] than you actually are."


Hardcore, indeed.