United Kingdom, Feb. 20 -- Liza Minnelli believes her descent into addiction began at her mother's funeral.

The Cabaret star "cried for eight straight days" after Judy Garland passed away from an accidental overdose in June 1969, and Liza believes her "final gift" from her mom was inheriting her battle against substance abuse.

In an extract from her new memoir, Kids, Wait Til You Hear This! shared by People magazine, Liza wrote: "I cried for eight straight days.

"Stress and tension overwhelmed me. I was reeling, and a doctor prescribed Valium to help me relax just before the funeral. What began as a one-day blessing soon turned into a habit, then a full-blown case of addiction in the years ahead.

"It was a final gift, a genetic inheri...