Two Madonna fans are suing the US singer for being late by more than two hours for a show last month in New York, according to court documents.
They state the show was meant to start at 20:30 EST on all three nights, but in each case it did not begin until after 22:30, ending around 01:00.
The case says they "would not have paid for tickets" had they known it would finish so late.
The BBC has asked Madonna, Live Nation and the Barclays Center for comment.
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