Sad news for Ozzy fans in Reno Nevada last night as Ozzy canceled his show due to sudden illness. But have no fear, he rescheduled his appearance for Saturday April 23rd.

(CNN) -- Heavy metal madman and reality TV star Ozzy Osbourne canceled a show in Reno, Nevada, Sunday night due to a "sudden illness," the concert promoter said.

"Based on advice from doctors, it is with great regret that Ozzy Osbourne is postponing his show ... at the Reno Event Center," Chris Martinez with Live Nation said in a statement. "The multi-platinum Rock & Roll Hall of Famer cannot perform ... due to a sudden illness."

The statement did not elaborate on what ailed Osbourne.

Looks like I'll have to schedule my vacation in April!