Justin Bieber Wakeboarding ... But Just Briefly

7/4/2016 1:23 PM PDT

0704-justin-bieber-wakeboarding-in-white-underwear-calvin-klein-FAMEFLYNET-01Justin Bieber has no shame in the wakeboarding game ... stripping down to his Calvins in the Miami sun. 

The Biebs jumped off a yacht he and some buddies rented for some soft-core water sports. 

That's how he rides.

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