From TMZ:

He might not be enrolled in school ... but Justin Bieber is definitely getting a taste of the college experience  ... 'cause we got a photo of the Biebs playing an intense game of BEER PONG. 

Even though he's underage, we know Bieber pounded some beer during the game ... just like every other underage college kid across the country. 

The question -- which country? 

Read the rest of the story at TMZ.com