Sharon Tate's sister has given Kate Bosworth's upcoming film about the last day of the tragic actress' life a big thumbs up.

Debra Tate recently blasted Quentin Tarantino's plans to centre his next movie, Once Upon a Time in Hollywood, around her pregnant sister's 1969 slaughter at the hands of Manson Family cult members, and the casting of Hilary Duff as her sibling in the "tasteless" The Haunting of Sharon Tate, but it seems she likes Bosworth's take.

She has thrown her support behind the actress' new project, which her husband Michael Polish is directing.

Tate, who has even signed on as a co-producer, tells Deadline, "At long last I have found filmmakers who are interested in the life story of my sister Sharon. Other projects have been a real source of pain in their insensitivity and gross exploitation of my sister.

"I am proud to join this very accomplished team to bring the story of the profoundly unique woman known as Sharon Tate."

Sharon was only 26 years old when she became one of the five people hacked to death by Charles Manson's followers almost 50 years ago. She was carrying filmmaker Roman Polanski's baby when she was slaughtered and just two weeks away from giving birth to her first child.

"From the very beginning, it has always been our intention to honour Sharon’s life,” Bosworth says. "She was a beautiful and complex woman - a sister, a daughter, a wife, a lover. Human. Her life has for too long been overshadowed by the tragedy orchestrated by a raging psychopath. Now, more than ever, we feel it is important to focus on the woman..."

"As a father and a filmmaker, I am not interested in portraying violence on screen with this particular project. It has no place in the Tate's life any longer," Polish adds. "I’m honoured that Debra has been generous with her life in sharing details that will make this movie one-of-a-kind."

Tarantino is reportedly keen to cast Margot Robbie as Tate in his film.