Kylie Minogue was forced to pull out of a performance with U2 due to exhaustion. The diminutive pop princess, who has beaten breast cancer, after being diagnosed with the illness in May 2005, was due to join the Irish rockers on stage on Monday as a thank you for frontman Bono performing a duet with her on the second night of her resumed “Showgirl Homecoming” tour in Sydney. However, Kylie, who is still not fully fit following an intensive programme of chemotherapy, had underestimated just how physically demanding the two-and-a-half-hour performances would be and was forced to grudgingly cancel her appearance. A source told Britain’s The Sun newspaper, “Kylie called Bono to explain that she had worn herself out. She is really feeling the physical effects of her return to the stage. He told her to spend Monday resting, get her energy levels fully restored and relax. It wasn’t a problem at all. Everyone realises Kylie is putting herself through the mill for the tour.” Kylie’s tour has ch
