During his performance Thursday night at London's 02 arena, Justin Bieber reportedly collapsed on stage because of some sort of breathing problems. The recent birthday boy went backstage, where he received oxygen for 20 minutes before bravely returning to finish the concert. Here's a video of his manager Scotter Braun telling the clearly concerned audience about Bieber's health:

After the show, Bieber was taken to the hospital for further medical treatment. But, as you can see from the photo above, he's obviously feeling well enough to post shirtless pictures to his Instagram. And if you're wondering what he's listening to, the answer is: Janis Joplin, because of course. Though as Fuse notes he spells her name "Janice," so maybe he's talking about this lady.

Anyway, the official word is that the doctors are still "figuring out what happened," but it seems likely he'll be well enough to perform at his show Friday night.

[Billboard, The Hollywood Reporter/Image via Instagram]