London ( CNN ) -- Singer George Michael has pneumonia and has been forced to cancel at least four shows , his website says . `` He is currently receiving treatment , '' the brief statement says . His representative Connie Filippello told CNN the singer was `` on the mend '' and `` receiving medication . '' She would not disclose information about where or when Michael had contracted the illness . Michael has postponed shows scheduled for this weekend in Cardiff , Wales , after putting off shows earlier this week in Vienna , Austria , and Strasbourg , France . He was also a no-show for a London concert scheduled for October 26 . That concert is now scheduled for May 2 , 2012 , his website says . He said at the time he had thrown his back out . CNN 's Stephanie Halasz contributed to this report .
NEW : Pop star George Michael is `` on the mend , '' his representative says . The singer has pneumonia , he announces .