Britney Spears at O2 in London arena on her Circus tour

Britney Spears sung at the O2 arena in London onJune 11, 2009 on her Circus tour.All around the O2, the posters and flashing billboards reminded us that Britney Spears’s first UK shows in five years were something other than a mere arena show. If you wanted to be reductive about it, you could argue that The Circus Starring Britney Spears merely alluded to the singer’s current album (also entitled The Circus).