Jennifer Lopez's twins have reportedly been 'running amok' on her tour.

It has been claimed that four-year-old Max and Emme have been causing chaos behind the scenes of her concerts. As well as being troublesome for the team making sure Jennifer's shows run smoothly, there are concerns the lively pair might hurt themselves.

'They have been running amok backstage while J-Lo rehearses for her sold-out concerts with Spanish singer Enrique Iglesias,' a source told Radar Online. 'They have been wrecking equipment... It's a miracle the twins haven't been electrocuted yet!'

Jennifer recently announced her decision to leave American Idol as a judge after two seasons on the show. She wanted to concentrate on raising her twins and focus on her music career. Despite her pledge to be a good parent, it seems she sometimes struggles to keep her kids in line.

'Jennifer has absolutely no control over her children,' the source laughed.

Jennifer is currently touring with Enrique Iglesias. The 20 city extravaganza began in Montreal on July 14 and will finish up in Miami at the end of August.