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16 April 2013, 16:34
The 'Boyfriend' singer makes a joke at being "crazy" as he shows off his gym body.
Justin Bieber has hit out at critics of his shirtless Instagram pictures by posting a series of new topless shots.
The 'Beauty And A Beat' singer tagged his new shots with a sarcastic response at those who say he must be "crazy".
"Uh oh @justinbieber is losing it taking shirtless pics in the mirror" -funny people," he wrote.
He added: "Breaking news worldwide @justinbieber just posted 2 shirtless pictures he must be going crazy" -funny people #forthefansanyways #dontbecreepin :p."
The singer faced criticism from some media sources after the was seen in the freezing cold in London without his shirt.
Meanwhile, Michael Bublé has spoken out in defence of the star this week and the way he handles the limelight.
The crooner said the teen star had a great level of "dignity" and doesn't think he would have been able to cope at his age.