Justin Bieber has been rushed to a hospital in London.
The singer reportedly collapsed on stage tonight during a show in O2 Arena, as witnesses took to Twitter immediately upon the incident and said Bieber passed out in the middle of a performance.
"He got oxygen from emergency personnel," a rep tells E! News. "He insisted on finishing the show. He is on the way to the hospital right now."
Following the collapse, Bieber's manager, Scooter Braun, apparently came out and told attendees that the 19-year-old had been feeling "very low of breath" throughout the concert and was backstage with EMTs.
On two occasions in the past month, Bieber was spotted around town in a gas mask.
He was mocked mercilessly for it, but might that have portended some kind of actual illness?
We'll update this story as news breaks, but send in your prayers for Bieber now!