Margot Robbie has teased the first image of herself in character as the murdered actress Sharon Tate from the upcoming Quentin Tarantino movie Once Upon a Time in Hollywood.

Tate, who was married to director Roman Polanski, was murdered by cult leader Charles Manson's followers in 1969.

Early plot details for the upcoming movie were revealed last November with a release date of August 9, 2019, the fiftieth anniversary of actress Sharon Tate’s murder.

Robbie took to Instagram to share the first official photo of her a dressed in a black long-sleeved turtleneck, a white skirt and white leather boots.  She wrote alongside the picture: "First look. #OnceUponATimeInHollywood@onceinhollywood."

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Brad Pitt has been cast alongside Leonardo DiCaprio in Tarantino’s upcoming drama.

Pitt has signed on to play TV star Rick Dalton in the drama which "takes place in Los Angeles in 1969, at the height of hippy Hollywood," while DiCaprio has been cast as his longtime stunt double Cliff Booth.

In a statement the Kill Bill filmmaker said: "I couldn’t be happier about the dynamic teaming of DiCaprio & Pitt as Rick & Cliff.

"Both are struggling to make it in a Hollywood they don’t recognise anymore. But Rick has a very famous next-door neighbour... Sharon Tate."

"I’ve been working on this script for five years, as well as living in Los Angeles County most of my life, including in 1969, when I was 7 years old.

"I’m very excited to tell this story of an L.A., and a Hollywood that don’t exist anymore."

The film will be released worldwide on August 9, 2019. Opening on the 50th anniversary of the day that the Manson family committed the LaBianca murders and the day after Tate was killed.