TMZ.com

Diddy 's just one of the boys behind bars ... laughing and chatting with other inmates in the yard in new photos from Fort Dix.

We've obtained pics of the star hanging out with a few dudes in the prison yard Saturday -- and, ya gotta check 'em out ... 'cause Diddy's got the biggest smile on his face. TMZ.com

Diddy's bundled up in a thick dark blue coat, gray pants and gray beanie ... shootin' the you-know-what with the other guys. TMZ.com

At one point, Diddy seems to be shaking hand with someone ... perhaps making a new friend. Regardless, all these guys seem interested just to chat with the guy -- no tension in the air whatsoever.

This is the second set of pics we've seen that show Diddy ... after we published a photo of the guy in prison yesterday where he appe

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