Ozzy cancels Reno show

A note on his website says that "on advice from doctors," the rocker had to postpone his show in Reno last night, "due to a sudden illness."

He is still scheduled to perform in L.A. on Tuesday.

We're waiting to hear from his wife Sharon, or some other rep, with an update on how Ozzy, 62, is doing.

It's a good thing this didn't happen a couple of weeks ago when Ozzy teamed up with Justin Bieber, 16, to shoot a futuristic Super Bowl ad for Best Buy. That meeting apparently went off without a hitch. It's estimated that the teen heartthrob will pull in a cool $1 million for his work. And Justin tweeted: "it's gonna be funny as heck."