Rihanna pregnant with Chris Brown's child?

R&B singer Rihanna is facing pregnancy rumours after she cancelled four tour dates due to mystery illness.

The reports about the 25-year-old 'Umbrella' hitmaker's pregnancy began to circulate when she cancelled the concerts, reported TMZ online.

The website cited sources close to Rihanna to claim that she is suffering from throat infection but her camp has been sketchy with details about her health.

There have been a slew of tabloid stories speculating that she's pregnant with on-off boyfriend Chris Brown's child.