She's done it again - Rihanna has axed a concert while she recovers from an "illness." Last month, the Barbadian beauty cancelled shows in Maryland and Massachusetts after getting sick.

The pop star cancelled her Monday night gig at the Toyota Center in Houston, Texas. Concert promoters Live Nation issued the statement: "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."

Rihanna is reportedly scheduled to perform in Dallas, Texas, on Tuesday night.

Last week rumors swirled that Rihanna and her on/again, off/again boyfriend Chris Brown split up. She told concertgoers in Los Angeles: "How many of you are in love? How many of you hate love? How many of you don't f**king understand it? I'm in that group. The confused group."

She later dispelled the gossip by posting an image of the two of them with the caption: "this s**t look like a toupee," quoting some lyrics from his song "Look At Me Now."