The Jamiroquai Facebook page has today (Friday 28 October) made the following announcement...

We are sorry to announce the cancellation of the gig at Lotto Arena, Antwerp (Belgium), on 3rd December. This is due to unforeseen logistical problems, which have led to the difficult decision to cancel the gig. We hope to re-arrange the gig in 2012.

This is unfortunately the eighth concert (as far as I know) to be cancelled this year.