Bieber's catching! Justin Bieber was feeling a little under the weather during a concert in Glendale, AZ, the first stop of his "Believe" concert tour.

While performing a song, the singer threw up onstage! Bieber left the stage after the incident and returned shortly after when, according to Popcrush, he asked fans, "Will you love me even though I’m throwing up on stage?"

He later tweeted, "Milk was a bad choice! Lol."

Here's the video. You're welcome.