Former 'Real Housewives of Orange County' star Lauri Peterson left the show years ago to help her troubled son ... but now he's in more trouble with a man he allegedly shot.
The man claims ... at 2:30 AM on June 20, Joshua Waring drove up to the sober living home they were staying at and started honking his horn. Residents came outside and told him to leave, which he did -- but then u-turned, came back and started firing shots at the crowd.
One of those bullets reportedly struck the 35-year-old man in the lower torso. Waring was arrested for the shooting hours later after a police chase and is still behind bars ... facing attempted murder charges.
The shooting victim wants Waring to pay up for his medical bills and all the pain and suffering he's caused him.