'Justin Bieber Reveals His Ab-tastic Calvin Klein Workout, But Did He Stuff Those Briefs?'

'Even Justin Bieber\'s haters have to admit -- the 20-year-old \"Baby\" singer is looking super-toned in his steamy new Calvin Klein ads.' 

Tags: etonline , et online , justin bieber , Calvin Klein , justin bieber ck , justin bieber body

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