Janet Jackson has been rushed to hospital after falling ill just hours before she was due to perform a concert in Montreal, Canada.

The R&B superstar was forced to cancel her show in the city on Monday night after she "got suddenly ill" during a sound check.

Jackson was taken straight to hospital just before she was set to take to the stage as part of her Rock Witchu tour - her first in seven years.

The star is being monitored by medics at a nearby hospital, according to a statement released by W+W Public Relations.

No further details were issued about the singer's current condition.