Tickets for Madonna's much-anticipated new tour have gone on sale this week and some fans have criticised the pricing of the upcoming performances.
It was announced earlier this week that the singer, 64, would embark on a world tour, titled Celebration, in the coming months - including performances within Europe.
The tour was initially due to visit the O2 Arena in London on one occasion, but three additional dates have since been added to the schedule. All four dates are in October.