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JLS hit the town last night after discovering they were spending their second week at No. 1 on the Vodafone Big Top 40.
The 'She Makes Me Wanna' singers spent the night partying at London club Alto where they reportedly racked up a £15k bar bill.
Marvin's girlfriend Rochelle joined the party, and brought along her Saturday's mate Vanessa for the celebrations.
"Such a proud girlfriend/friend," Rochelle tweeted JLS.
"Well done to my favourite 4 men...
"Love you boys loads! XX"
The guys spent their thousands on vodka and champagne, which ruins Max from The Wanted's theory that the boys are lightweights.
"JLS say they can drink, but they can't," Max said last week.