London, England -- It didn't take long for Justin Bieber to have a run-in with paparazzi after leaving the hospital in London.
Bieber yelled and swore at a photographer who tried to take his picture. Bieber tweeted that he let the paparazzi get the best of him. But he says sometimes he can't help himself "when people are shoving cameras in your face all day and yelling the worst thing possible at you." All in all, he says it's been a "rough week."
Bieber tweets that he plans to channel his adrenaline into his concert tonight. He had to temporarily leave last night's show when he got out of breath and then fainted backstage. After getting oxygen, medics said he could finish the show. But afterward, he was taken to the hospital where he tweeted a photo of himself, shirtless of course. He said he was chilling out by listen to Janis Joplin, except he spelled Janis wrong. Instead of J-A-N-I-S, he spelled it J-A-N-I-C-E.