Madonna has been fined $270,000 by London's Wembley Stadium. The "Material Girl" hitmaker incurred the hefty fee after running over the stadium's strict 10.30 pm curfew by 40 minutes on September 11 - $100,000 for every 15 minutes she was late.

A source says, "The concert was meant to start at 8.30 pm but Madonna didn't come on stage until 9.10 pm. The gig ended at 11.10 pm so she was quite a bit over. Her people knew about the possible implications for going over the curfew but this is a pretty hefty fine, even for Madonna."

Madonna is not the first pop star to fall foul of Wembley`s curfew. British singer George Michael was fined $260,000 when his concert also ran over time last year.

The "Sweet&Sticky" tour will finish in Brazil on December 21.