Apparently his music affects him the same way it does most people over the age of 14, because Justin Bieber hurled right onstage while performing in Glendale, Arizona Saturday night. And thanks to the magic of pre-recorded tracks and lipsyching, he never even had to stop singing! TMZ says:

The show was the first on his new “Believe” tour and even though he was forced to leave the stage twice due to illness, the show went on.

Bieber apologized to the crowd for being sick, but the crowd didn’t seem to mind too much and cheered him on throughout.

I didn’t look that hard, but apparently whatever he threw up was white, which he later explained on Twitter to be the end result of the stomach flu and the glass of milk he’d downed before the show. That’s right… milk. Wink. He should count himself lucky. Poor Rod Stewart ended up in the ER getting his stomach pumped when the same thing happened to him.