Aguilera: 'I feared for my unborn child's life'

Christina Aguilera was crippled with fears for her unborn child during her world tour earlier this year - she wore a carefully-hidden heart monitor in case of emergency.

The pop star admits she was terrified when she found out she was pregnant during the seven-month 'Back to Basics' tour, which ended in May, and would have quit if doctors hadn't come up with an ingenious way of reducing the risks.