Music
Rex Features
The popstar was greeted by boos from several audience members at the festival after he opened his performance with the blunder.
However, the 'Love In This Club' singer insisted he hadn't forgotten where he was playing, claiming instead that he was paying tribute to his favourite football team Manchester United.
Usher said that he is "good friends" with United and England defender Rio Ferdinand and argued he was just voicing his support for the soccer club, who won the Premier League at the weekend.
Singles Reviews
Darren Hayes: 'Bloodstained Heart' review Hayes continues his pursuit for old-fashioned romanticism.
The Sound
Sunday chart predictions: Maverick Sabre, moreHas Maverick Sabre topped the album charts? Find out in Friday's midweeks.
Music Interviews
Adam Lambert eyes Jessie J collaborationDigital Spy talks to the singer about his new album 'Trespassing'.
Album Reviews
Speech Debelle: 'Freedom of Speech'Speech Debelle storms back with her second album Freedom of Speech.
