Madonna's condition was so serious that her relatives were 'preparing for the worst,' a family member has told DailyMail.com.

The 64-year-old was found unconscious in New York on Saturday, and rushed to the ICU where she was reportedly intubated overnight.

On Wednesday, her manager Guy Oseary announced that she was suffering from a 'serious bacterial infection', and needed time to recover so was postponing her tour, due to begin in Vancouver on July 15.