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Rex Features
The group donned school uniforms and blonde pigtails ahead of the popstar's appearance on tonight's show.
Their eventful week also involved being dispatched to a speed dating event with 11 women by The Xtra Factor.
JLS are eager to progress into the semi-finals and were reportedly "shell-shocked" at finding themselves in the bottom two last week.
The X Factor airs at 7.35pm and 10.15pm tomorrow on ITV1.
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