Justin Bieber's performance at the 02 arena was interrupted after he collapsed on stage, according to his spokeswoman LONDON (AP) — Justin Bieber says he is "getting better," after fainting backstage at a concert in London, and the venue says Friday's show is scheduled to go ahead as planned. A spokesman for the O2 Arena said the 19-year-old pop star was treated backstage during Thursday's concert after becoming short of breath, but recovered and finished his set. "As far as we are concerned everything is on, on, on" for Friday's show, Jeremy King said. "He was treated by our team of medics and after further examination they didn't find anything more serious or worrying." A spokeswoman for Bieber said he was given oxygen and took a 20-minute reprieve after fainting backstage at the arena on Thursday. Bieber later posted a shirtless photo of himself in a hospital bed with the caption: "Gettin better listening to Janis Joplin.&q