By Lincoln Feast and Patricia Reaney SYDNEY/NEW YORK (Reuters) – The Rolling Stones cancelled a concert in Australia, leaving their ‘Down Under’ tour in limbo on Tuesday, after lead singer Mick Jagger’s girlfriend L’Wren Scott was found dead in her Manhattan apartment. Scott, a 49-year-old fashion designer and former model, was found hanging from a scarf on Monday, police said, adding they were treating her death as a suicide. Hollywood star Nicole Kidman, a friend of 25 years, was “heartbroken and in shock right now and unable to say anything,” her spokeswoman said. The Rolling Stones had been due to kick off a six-concert Australia and New Zealand leg of their world tour on Wednesday in Perth in western Australia.