Rihanna is apparently too sick to sing again.

Live Nation announced that tonight's show in Houston will not go on "as a result of illness," but the concert promoter stated that people should hang on to their tickets so that they can be honored at a later date.

Rihanna previously missed two dates on her Diamonds World Tour in March due to laryngitis.

There's been no explanation from Ri-Ri yet, the only tweeted missive today being a happy birthday message to her brother  Rajad.

She reportedly attended a pal's birthday party at Marquee in Las Vegas on Friday, along with opening act A$AP Rocky and Snoop Lion.

Rihanna's tour is supposed to touch down in Dallas tomorrow.

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