Britney Spears has officially announced the first dates of her planned 2009 world concert tour. Britney is booked to play the spectacular O2 Arena in London, England on June 3rd and 4th. Concert dates for Britney in the United States as well as more UK dates are expected to be announced in the coming weeks. Britney has not performed a full stadium concert since her 2004 gig in Dublin. Britney Spears’ sixth studio album “Circus” will be released on December 2nd, Spear’s 27th birthday.