Celebrity / Marston Hefner Hef's Son Must Stay Away From Playmate Girlfriend Marston Hefner ordered to attend violence intervention program By Mary Papenfuss, Newser Staff Posted Mar 21, 2012 12:36 AM CDT Copied Claire Sinclair showed cops bruises. (Getty Images) See 1 more photo Hugh Hefner's son has been ordered to attend a 52-week domestic violence intervention program after he was charged with attacking his Playmate girlfriend. Marston Hefner, 21, pleaded no contest to charges of corporal injury after Playmate of the Year Claire Sinclair told police he punched her and kicked her in the stomach in the couples' Pasadena apartment last month. Marston was also ordered by the judge to stay away from Sinclair, reports TMZ. (More Marston Hefner stories.) See 1 more photo Report an error