LONDON (March 7, 3013)--Justin Bieber fainted backstage Thursday at a concert in London, a spokeswoman for the teen idol told The Associated Press.

The spokeswoman said Bieber, 19, was given oxygen and took a 20-minute break after fainting backstage at London's O2 Arena.

In a video of the concert posted online, Bieber's manager appeared on stage Thursday and told the crowd that the singer was feeling "very low of breath," but that he would return to finish the show.

The "Baby" singer is in London to perform four concerts at the O2 arena.

He was widely criticized for arriving late to his first show Monday.