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Will Smith just slapped a Ukrainian reporter across the face at the Moscow premiere of "Men in Black 3" -- and it was all caught on tape.

The Ukrainian reporter tries to kiss Will on the lips on the red carpet and the actor angrily pushes him away and then backhands him across the face.

You can clearly see that Will is incredibly pissed that the guy showed overt affection toward him.

After Will slaps the guy, Will says, "He's lucky I didn't sucker punch him."

We're told the dude who kissed Will is a television reporter who often kisses celebrities -- it's his schtick.

For the record, Will just came out in support of gay marriage.