Ozzy Osbourne Suffers "Sudden Illness," Cancels Concert

Rock star, 62, wasn't able to perform in Reno, Nev., Sunday night and has postponed the show until April

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.