LONDON, ENGLAND - JUNE 11: Usher performs for the 'American Express Unstaged' series, in partnership with VEVO and YouTube, at Hammersmith Apollo on June 11, 2012 in London, United Kingdom. (Photo by Samir Hussein/Getty Images for American Express)
LONDON, ENGLAND - JUNE 11: Usher performs for the 'American Express Unstaged' series, in partnership with VEVO and YouTube, at Hammersmith Apollo on June 11, 2012 in London, United Kingdom. (Photo by Samir Hussein/Getty Images for American Express)