The celebrity blogger sued the Peas' manager in Los Angeles on Wednesday for battery and intentional infliction of emotional distress. He is seeking unspecified damages in excess of $25,000.
The suit states Hilton is seeking to protect his rights to free speech and claims Polo Molina attacked him because he made critical comments about the Black Eyed Peas' new album.
Molina was arrested in Toronto early Monday after he allegedly punched Hilton following a heated argument between the blogger and Black Eyed Peas leader will.i.am.
An e-mail sent to the group's publicist was not immediately returned Wednesday.