Kelly Clarkson Performs 'What Doesn’t Kill You (Stronger)' on X Factor

The original American Idol Kelly Clarkson was briefly reunited with Simon Cowell and Paula Abdul the other night, as she took to the stage of the US X Factor to perform a song off her brand new album.

“What Doesn't Kill You (Stronger)” is the title track off Clarkson's album “Stronger” and is, as fans must already know, a power anthem.

Kelly certainly looked the part of the motivational speaker: dressed in a bandage dress and looking stunning, and with images and messages playing on the screens behind her, she literally poured her little heart into the performance.

At the end of it, as she was getting a standing ovation, she can be heard muttering into the microphone “Hey Simon, hey Paula.”

Fans must know that they were also on the panel of judges on the first season of American Idol, when she was crowned winner.