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12 January 2012, 11:05 | Updated: 12 January 2012, 11:13
The 'She Makes Me Wanna' singers also hoping to get in top shape for the newly engaged singer's celebration.
JLS are reportedly planning a huge no-expense-spared party to Miami and Las Vegas for singer Marvin Humes' stag do.
The 'Do You Feel What I Feel' star is rumoured to be planning a March wedding to The Saturdays singer Rochelle Wiseman and preparations for the stag do allegedly took shape straight away.
A source told The Sun: "JLS have seriously started plotting Marvin's last trip as a free man. They started work on it as soon as he got engaged to Rochelle on New Year's Eve. Marvin and the lads have decided it will be a no-expense-spared event with a huge group of mates and stop-offs in Las Vegas and Miami."
Apparanetly, Rochelle is worried that the boys will out do her own celebrations and thinks it could be a little excessive.
"Rochelle thinks it's all pretty over the top and is worried she won't be able to better it with her own group of friends," added the source.
With the wedding rumoured to be just round the corner, the boy band are hoping to get in tip top condition for the break and are all taking on a carb free diet.
The source confessed: "The band are already competing to get their beach bodies in shape in time for the stag do and have been joking that they are doing 'No carbs before Marvs' to stay slim before the trip."
The couple announced their engagement on New Year's Eve during their winter vacation.