Justin Bieber -- Too Cool for School During Court Appearance

Justin Bieber made a point of showing off his tattoos and his muscles during his court appearance Thursday in Miami Beach.

Bieber appeared via closed circuit TV as the judge set bond in his DUI/resisting arrest/driving on a suspended license case.

Check out how Bieber rolled up his jumpsuit sleeves. He let his arms do the talking because he said nothing as the judge set bail at $2,500 ... which we're guessing he can afford.

It's not exactly a capital offense, but Bieber hired the best ... attorney Roy Black, who helped William Kennedy Smith beat the rape rap. He's also repped Rush Limbaugh and Kelsey Grammer.