JLS surprised 2 excited girls by pulling them on stage at a secret X Factor gig.

The boys - Aston Merrygold, Oritse Williams, Marvin Humes and JB Gill - performed Mariah Carey’s One Sweet Day and their medley of Stand By Me/Beautiful Girls at the exclusive concert.

Usual lead singer Aston was forced to mime along to the track after losing his voice in rehearsals.

SEE PICS All the action from the X Factor secret gig>>> 

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Holly Arnold

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