The 19-year-old singer posted a shirtless picture of himself backstage and a video of himself lip-synching to Drake after his San Diego concert on Sunday, reported Radar online.
"Blue is new and you are too a few shoes have shown me clues my crew also knew that zoos have news. I'm a poetic genius," he wrote on his photo-sharing site Instagram.
Friends close to Bieber are increasingly worried that he has a substance abuse problem. His manager, Scooter Braun, reportedly wants him to go to a rehab.