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What on earth is going on on Coolio’s head!?

Photos: Fame

TMZ has learned Coolio has just been arrested at LAX for possession of crack cocaine.

The rapper was going through a security screening to get to his Southwest Airlines flight when a screener found crack cocaine on his person.

Sources close to the situation say Coolio — real name Artis Leon Ivey, Jr — got physical with the screener at some point during the incident.

Coolio is being booked by LAX police right now.