Credit: Michael Becker/FOX Photo: Stefano Langone Listens to the Judges in Season 10, Episode 7: The San Francisco Auditions

Stefano Langone — the American Idol contestant who showed his massive scars — was the victim of a drunk driving accident in 2009 ... and TMZ has learned, he's suing the culprit.

According to the lawsuit — filed in April last year — Jacob Sheppard collided with Stefano's car in King County, Washington.

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