Rubuta ci gaba don wannan sakin layi - A cikin wannan shekarar, ta fito a matsayin Sharon Tate tare da Leonardo DiCaprio da Brad Pitt a cikin wasan kwaikwayo na wasan kwaikwayo na Quentin Tarantino "Once Upon a Time in Hollywood", tare da Robbie kasancewa "zaɓi na farko da kawai" na Tarantino don yin wasan kwaikwayo na marigayi. Tare da barazanar Tate-LaBianca kisan kai
yin aiki a matsayin bango, fim din ya ba da labarin wani dan wasan kwaikwayo mai ban mamaki (DiCaprio) da kuma dan wasan kwaikwayo na biyu (Pitt) yayin da suke kewaya masana'antar fina-finai mai saurin canzawa a 1969 Los Angeles. Jin "babban nauyin alhakin", Robbie ya shirya don rawar ta hanyar saduwa da dangin Tate da abokai, kallon duk fina-finai da kuma karanta tarihin rayuwar Tate na mijinta, Roman Polanski. "Once Upon a Time in Hollywood" an fara shi ne a bikin Fim na Cannes na 2019 don jin daɗin jin daɗi, kuma ya kasance nasarar kasuwanci tare da samun kuɗi na duniya na dala miliyan 374.3. Duk da cewa mutane da yawa suna sukar rashin Robbie a cikin fim din, Robbie Collin na "The Daily Telegraph" ya nuna wani yanayi tare da Robbie a cikin silima, wanda ya gano shi ne fim din "mafi ban sha'awa".