Jessie J Performs 'Who You Are' on 'The X Factor' U.K. [Video]

Jessie J left her heart on the stage during her emotional appearance on the U.K.’s “X Factor” today. The British songstress, dressed demurely in black, performed the title track off her debut album Who You Are, tweeting about the experience. “In tears. I love to sing. I love writing songs. Thank you to all that support me,” she wrote.