Hugh Hefner’s widow opened up about the late Playboy founder’s opioid addiction, RadarOnline.com has learned. Former Playmate Crystal Hefner, 37, detailed Hugh’s addiction to opioids in her new forthcoming memoir, Only Say Good Things. According to an excerpt from the autobiography, the 37-year-old revealed her late husband kept an “earthquake supply” of the highly addictive prescription drugs in his infamous Playboy Mansion. Crystal claimed Hugh’s addiction was well-known among mansion staff, even though “no one ever talked about it.” Never miss a story — sign up for the RadarOnline.com newsl…