PLAYBOY founder Hugh Hefner's oldest son has been busted for allegedly attacking his girlfriend, former Playmate of the Year Claire Sinclair. Police responded to a 911 call from a Sinclair family member, saying that Marston Hefner had attacked her, TMZ reported. Officers found Sinclair, the 2011 Playmate of the Year, with visible injuries, including bruises and red marks. Sources told TMZ that Hefner, 21, punched and kicked Sinclair, 20, and she then called family members, who in turn called police.