Baby-faced pop star Justin Bieber said too much milk before a concert was to blame after he vomited on stage, twice.

The Biebs reportedly asked screaming fans, “Will you love me, even though I’m throwing up on stage?” during his sold-out show in Arizona on Saturday night.

Video posted online shows the teen pop sensation turn away from concertgoers, hunch over, throw up and then run off the stage.

Proving that the show, indeed, must go on, his background dancers didn’t miss a beat during the incident.

Bieber returned to the stage after being sick and even performed an encore.

Local media reported that his fans sang his songs while he was offstage and Bieber later apologized for being sick.

After the show Bieber tweeted: "Great show. Getting better for tomorrow's show !!!! Love u."

He later added: "And .... Milk was a bad choice!"

Bieber's 45-city "Believe" tour continues on Sunday at the MGM Grand Garden Arena in Las Vegas.

With files from The Canadian Press