Ex-UFC star BJ Penn was arrested again this week -- this time, he's accused of punching and kicking a 45-year-old man in Hawaii.
Hawaii Island Police say the 46-year-old former fighter was arrested and charged with third-degree assault stemming from an incident early Tuesday morning.
Cops were called to a residence in Hilo around 1 AM ... when the man said Penn hit him several times before he was able to flee the scene.