As announced earlier this week, the 16 acts have covered Rose Royce's 1978 hit 'Wishing on a Star'. Proceeds from the track, released next month, will benefit ACT & Children's Hospices UK.
Following their elimination in the first live show, 2 Shoes, Amelia Lily, James Michael and Jonjo Kerr were reunited with the remaining 12 finalists to record the song at Metropolis Studios in London.
The X Factor continues on Saturday at 7.45pm on ITV1.
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Take a look through our gallery to see the 16 acts in the studio: