The popstar explained on Instagram, "I was sick since San Diego! I kept working because I thought two days off after the Vegas show would be enough time to recover and I f**ked up, those were two days off from hell and today is not different! I'm sad and disappointed about it! I had all kinds of plans for Houston!"

The tour promoter Live Nation says the Houston date has been postponed, and will be rescheduled, not canceled. Their statement said, "Unfortunately, as a result of illness Rihanna is unable to perform this evening at Houston's Toyota Center. Fans are instructed to retain their tickets to this event pending rescheduled show date information."