All 16 contestants will be tackling tracks from a 'UK v US' back catalogue when the show kicks off on Saturday night at 7.30pm on ITV1.
Complementing the theme are special guests from the UK and US. Last year's X Factor winner Matt Cardle will be giving a live performance of his single 'Run For Your Life' as he attempts to top the UK singles chart for the second time.
Meanwhile, Cee Lo Green will be representing the US with a special performance of his latest track 'Cry Baby'.
Frankie Cocozza, Kitty Brucknell, Amelia Lily and Janet Devlin are among the 16 hopefuls currently preparing themselves for Saturday's first live show.
The X Factor airs on Saturday at 7.30pm and on Sunday at 8pm on ITV1. Olly Murs and Caroline Flack's The Xtra Factor follows immediately after both shows.
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Scroll through the gallery below to see the Top 16's style makeovers: