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Ozzy Osbourne

Theo Wargo/Getty Images

Well, we already know Ozzy Osbourne has a supersized case of Bieber fever.

But we're assuming that's not what caused the heavy metal legend to cancel his concert in Reno, Nev., on Sunday night.

All that a promoter for the singer's Scream tour has said so far, though, is that the 62-year-old Osbourne couldn't perform due to "a sudden illness."

The concert has subsequently been rescheduled for April.