Visit the official site: http://itv.com/xfactor Watch Tammy Cartwright sing One Night Only by Jennifer Hudson Brace yourself for a double-whammy of Tammy! Not only do we bear witness to Tammy's powerhouse performance, but we also get to meet her 'nutty nan,' May. Watch as May storms the stage to support her granddaughter, scoring herself some smiles off Mel B AND a hug from Dermot. Atta girl! SUBSCRIBE: http://bit.ly/TXFSub Facebook: http://bit.ly/TXFFB Twitter: http://bit.ly/TXFTwi Buy Live Tour Tickets: http://bit.ly/Lf56QY