Janet Jackson performs at the Madison Square Garden Center as part of her 'Rock Witchu' Tour 2008, New York City, USA - 01.11.08

The pop superstar had hoped to reschedule the gigs she was forced to axe when she fell ill with a vertigo-related condition.

But, in a posting on her website, the Nasty singer has announced the Rock Witchu tour dates will not go ahead due to "conflicts in the singer's schedule".

In total, seven concerts have been scrapped.

Source: WENN