Marvin Humes' JLS bandmates turned up to his stag party wearing face masks of his fiancee.
As they arrived in the gambling mecca, his bandmates - Oritse Williams, J.B. Gill and Aston Merrygold - organised for everyone to wear masks with Rochelle's face on to start off the celebrations in style.
A source said: ''A bus pulled up to Las Vegas airport to take Marvin and nine of his closest mates up to their super-expensive hotel.
''When Oritse got on the bus he pulled out masks of Rochelle's face and passed them around for everyone to wear. Oritse then made a speech telling Marv to get used to Rochelle's beautiful face being around 24/7 once they're hitched.''
Oritse is in charge of the whole trip and has organised a strict timetable as well as lots of drinking and fun.
The source continued: ''The lads have brought along a bag of goodies to keep them entertained and embarrass Marv. They were passing round a huge bottle of Grey Goose vodka on the bus.
''They have also spoken to the hotel manager about having a pool party.''