Watch: Florence and The Machine & Nicole Scherzinger Perform on 'The X Factor USA'

Florence and The Machine and Nicole Scherzinger were the celebrity guest performers on Thursday's results show of 'The X Factor USA' (December 15th) - First, the British indie/pop band, led by the flawless Florence Welch, treated Fox viewers with the first televised performance of their new US single 'Spectrum', off the 'Ceremonials' album. Then, judge Nicole 'The Scherzy' debuted her new single 'Pretty' live. It was a risky move! Going ahead peforming a song nobody knew yet, or was informed of. Still, I liked 'Pretty'. Very different to what Nicole has released, and recorded in the past. She keeps trying and trying to find THAT song that will help her crack America for real as a solo artist after all this time. Could 'Pretty' be the one?

What do YOU think of these performances?