JLS say they have a "massive plan" for Marvin Humes's stag do.
The singer got engaged to girlfriend Rochelle Wiseman from The Saturdays last month.
"We had an amazing time and we're looking forward to great things in 2012," said Humes - who proposed to Wiseman during a holiday on the Caribbean island of Antigua.
The band now say they are planning something special for Humes's stag party.
"We were talking about that all week," Oritse Williams told Newsbeat.
Fellow member Aston Merrygold added: "There is a massive plan, a massive plan, trust me.
"All I'm going to say is you'll need a map."
JLS reached number two in the UK album chart in November with Jukebox.
The album featured their singles Take A Chance On Me and She Makes Me Wanna, which both reached the top five in the UK singles chart last year.
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