Bad news for Van Andel Arena ticket holders. Katy Perry has an upper respiratory illness and is too sick to sing tonight.

John Gonzalez of The Grand Rapids Press reports that tonight's (Sept 11) concert has been postponed until December 1.

Katy's Twitter account has been indicative of a sick Katy for a few days now, but she has been playing concert dates like a trooper. However, it looks like she finally has to take a break and recover. Just our luck.

There's no information yet about refunds if you have tickets and can't make the new date. Here's a quick link to The Van Andel Arena's website.

Get well soon Katy!