Justin Bieber was taken to the hospital in London yesterday after collapsing backstage during his show. A source close to his camp said Justin started feeling woozy during his show at the O2 area, and with 4 songs to go, he stumbled backstage where he collapsed. 

He was reportedly taken into a private room where he was treated with oxygen from emergency personnel. Sources say he was advised to go to the hospital, but declined all because he didn't want to disappoint his fans. He wanted to finish his show, and that's when his manager Scooter Braun went on stage to make an announcement. Watch below:

UPDATE: Justin returned to the stage a short time later to complete the show, received a huge ovation, then was transported to the hospital directly following the show. he's still there receiving treatment. We're told he's in good spirits and feels OK ... but doctors want to evaluate him.