Kelly Clarkson 'Mr. Know It All' and 'Walk Away'

Singer performs new single 'Mr. Know It All'

Kelly Clarkson turned up on last night's results episode of Dancing with the Stars to perform "Mr. Know It All," the first single from her new album, Stronger. Clarkson, always a vocal powerhouse, turned in a fierce performance that wasn't overshadowed by the, you know, dancing stars. Later, she hit the stage again to sing a powerful version of her 2006 smash hit "Walk Away."