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That man is instant celebrity POLO MOLINA . . . a manager for the BLACK EYED PEAS.

Hilton is suing Molina for battery and intentional infliction of emotional distress. He's seeking damages of at least $25,000.

There's no word whether Perez will file any more lawsuits . . . but his lawyer claims he's conducting a, quote, "legal investigation" into whether Black Eyed Peas leader WILL.I.AM encouraged the beat-down.

And he said, quote, "All persons responsible for this cowardly act of physical violence will be sued and held legally responsible for their actions. His First Amendment rights will not be infringed upon through fear, intimidation or violence." (--SHUT UUUUP!!!)

Molina, by the way, is on probation for a 2006 DUI. So he could get six months behind bars just for the probation violation.