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The chart-toppers are taking Marvin on a trip to the USA to revisit some of their favourite nightclubs.
Marvin got engaged to The Saturdays singer Rochelle Wiseman over Christmas, and JLS want to celebrate in style.
'The best part about it is that when he leaves the house he’ll have no idea where he’s going,' said bandmate Aston.
'He’ll have his passport and that’s it,' beamed the 24-year-old.
'There’ll be no airline ticket or anything and we’ve given the pilot strict instructions to not announce where the plane is going.'
The boys are in competition to get their beach bodies in shape in time for the stag do, joking that they're on a 'No carbs before Marvs' diet to keep trim!