The 20-year-old Canadian pop star appeared shirtless at a club in Cannes and did his best version of a Tupac classic.
Bieber, who was at Gotha Club with Rick Ross, rapped along to the Tupac song "Dear Mama."
He also hopped on stage to join Ross as the rapper performed on stage.
The singer was in France to catch the Cannes Film Festival. He later tweeted a picture of himself posing with Ross with the caption “Boss.”