The 'Home' singer's little boy is set to undergo treatment for liver cancer.
JLS taking private jet for Marvin's stag do
JLS Kick Off 4th Dimension Tour
See the pictures from the first night of the chart-topping act's arena tour in Liverpool last night.
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!
The star headed straight from the jungle to panto...but clearly hadn't had time to learn her lines!