British singer George Michael has been forced to postpone the rest of his European tour due to ongoing treatment for “severe” pneumonia, his spokeswoman said Friday. But she denied reports that the former Wham! frontman was suffering from serious heart problems and said he was “slowly improving” in hospital in Vienna. “George Michael is ill with pneumonia and any other speculation regarding his illness is unfounded and untrue,” she said in a statement. “He is receiving excellent medical care; he is responding to treatment and slowly improving.” His doctors advised that the chart-topping artist behind such solo hits as “Careless Whisper” and “Faith” should postpone the rest of his Symphonica tour. All British dates of his Symphonica European tour have been called off, including three this month and 11 in December. __