Fat Joe got a bunch of kids to lean back and crank the fun all the way up ... at a bar mitzvah!
The rapper made the surprise appearance in NYC Friday night for a boy named Casey, son of Ira Judelson -- bail bondsman to the stars.
Joe showed up at 7:15 PM and stayed for almost 2 hours ... performing "All The Way Up" and "Lean Back."
Fat Joe is business partners with the kid's dad. Who knew bail bonding was so baller?
Waiting for your permission to load the comments.