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Fans in Houston will have to wait a little longer to see Rihanna and her special guest rapper A$AP Rocky.  The R&B superstar cancelled her Monday night concert at Space City's Toyota Center due to illness. 

The performance is part of Rihanna's "Diamonds World Tour."  The Toyota Center's website instructs fans to hold on to their tickets because RiRi plans to reschedule the event.   Rihanna previously cancelled shows in Baltimore and Boston after coming down with the flu and laryngitis.  

She's gearing up for the release of her documentary "Rihanna 777," which was filmed during her recent 7-7-7 tour.  The doc is scheduled to air on Fox on May 6th.  

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