Pop singer Justin Bieber, 18, threw up while performing in Arizona in US on Saturday night. A 16-second clip posted on TMZ shows Bieber vomiting profusely and running to the side of the stage. On returning, he apologised to the crowd for being sick and asked, “Will you love me even though I’m throwing up on stage?” The singer later tweeted that the incident took place due to ‘drinking too much milk’.