Justin Bieber collapses backstage in London

About few hours ago, it was reported from a reliable source, that Justin Bieber was rushed to a hospital in London after he collapsed backstage.
A source reported that Justin who had four songs to go, was feeling dizzy at a point then went backstage where he collapsed.
Right from O2 Arena, Justin Bieber was rushed to a private room in an hospital where he's being treated with oxygen from an emergency personnel.
He was warned! Yes, he was advised to visit the hospital before the show but turned it down and said he had to finish the show for his fans.

UPDATE: Doctors have reported that he's doing fine now even though still on treatments, but needs some evaluation.