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See exclusive new footage from their upcoming DVD
The clip, which you can watch below, is taken from the band's new DVD 'Eyes Wide Open' and shows Oritsé Williams taking to the mic in a pub.
In video below, the bar owner mistakenly says the singer's name wrong when he introduces Oritse on stage to sing JLS' hit 'One Shot'.
As Marvin, Aston and JB chant along, Oritsé says: "You know my name. I've been in a band long enough for you guys to know my name."
'Eyes Wide Open' was filmed on JLS' sold-out UK arena tour and goes behind the scenes to hear from the band about what goes into being the group.
Eyes Wide Open went top five at the UK Box Office chart on day of release earlier this, making it the best attended music cinema in UK history.
The DVD, which is released on 5th December, features concert footage from the band's performance at the O2 Arena in London in January 2011.