Kylie Minogue is at war with doctors over plans for a mammoth world tour to celebrate her 40th birthday next year.
The '2 Hearts' singer - who was forced to postpone her 'Showgirl' tour when she was diagnosed with breast cancer in May 2005 - has been warned by specialists such a gruelling schedule could have detrimental effects on her health.
A source said: "Kylie is determined to do this tour. She was upset that she had to pull out of the last one - the 'Showgirl' tour - when she received her cancer diagnosis. If it was up to her, she'd do an endless string of dates but doctors say she needs to make herself priority and takes more time to relax."
Kylie - who was given the all-clear from breast cancer in early 2006 after having a partial mastectomy and a course of chemotherapy - is finding it difficult to accept she can no longer put her body under such duress.
The source added to Britain's Daily Express newspaper: "The doctors don't think travelling so much to perform each night is a good idea. Knowing Kylie, she will want to push herself. But she just can't as much as she used to."
The diminutive star has teamed up with good friend and designer William Baker to ensure her concerts - which will kick off just days after she reaches the milestone age on May 28 - are as spectacular as possible.
William said: "I am so busy. I'm heading back into the studio with Kylie in February to start training for the tour we want to do in June. It's going to be fabulous. I have a couple of ideas but they need a bit of work. It takes ages to pull it all together so we want to take our time on it." | 
