KISS WILL SMITH AT YOUR OWN RISK....

Will Smith may be one of Hollywood's nicest guys...just don't try to kiss him. TMZ reportsthat Big Willie slapped a male reporter at the "Men In Black 3" premiere in Moscow who tried to give him a peck or two on the cheek and on the lips on the red carpet.

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


Was he right to have slapped him???