Ja Rule - Got RIPPED!!! in Prison!?

Apparently Ja Rule smuggled a couple of guns out of prison ... 'cause the dude is YOKED!!!!

The rapper just posted a photo to his Instagram page ... showing off the jacked physique he built while serving out his 2-year sentence in a NY prison for attempted illegal gun possession and tax evasion. 


The 37-year-old rapper was obviously hittin' the weights during his time in the big house ... and clearly the hard work paid off ... 

Unlike some other prisoners we know .. ?Click To See Who?