John Legend got involved in a row with his own fans at a gig this week, according to a report.

The singer had agreed to perform an aftershow at Sound on Leicester Square following his show at Brixton Academy on December 28, but was forced to pull out when organisers decided he wasn't in a fit state to sing.

A source told The Mirror: "John looked glassy-eyed and unsteady on his feet when he arrived around midnight. So the promoters decided that his younger brother should play instead."

The newspaper claims that John was furious when disappointed fans started to boo his sibling.

"John was incensed," the source added. "He grabbed the mike from his brother and told the crowd to 'f**k off'. Then he laid into them, saying they should show respect."