'16 & Pregnant' Baby Daddy -- Another Arrest ... Another Classic Mug Shot

Weston Gosa -- the dude who knocked up Whitney Purvis on "16 & Pregnant" -- was arrested again Tuesday ... and his mug shot is the absolute best of the trilogy.

Law enforcement sources tell us ... Weston was pulled over in Georgia for speeding and driving on a suspended license. He's currently being held at the Floyd County Jail in Rome, GA on a $1,710 bond.

As we previously reported -- Weston was busted last December for smashing some electronics ... and popped again last July after allegedly crashing his car while driving under the influence (which spawned the infamous "sleeping mug shot").

Are the people who cast that show that good ... or just lucky?