The X Factor: Fifth Harmony & Demi Lovato's Duet
Fifth Harmony and Demi Lovato became Sixth Harmony, hitting the stage together for THE X FACTOR judge's hit single, "Give Your Heart a Break." Simon Cowell begrudgingly admitted, "It pains me to say this, but Demi Lovato, you were sensational."
Season 2 Episode: 26
Air Date:Dec 18, 2012