The X Factor excitement is turned up a notch this weekend as the final 16 contestants took to the stage for the start of the live shows last night. They've been through auditions, Bootcamp and the Judges’ Houses stages of the show and beat off competition from thousands of others. Now, the final 16 are preparing to perform live in front of The X Factor judges and an audience of millions to win The X Factor 2011 and scoop a £1m recording deal. Last night's theme is UK v US, with each act singing a big hit from either side of the pond. Tonight will also see the UK v the US as Matt Cardle and Cee Lo Green perform, before each judge sends home one act, leaving three acts they most believe can win through to next week's public vote.