Margot Robbie looks like a mommy to be while filming her forthcoming movie 'Once Upon a Time in Hollywood.' The star is playing the role of Sharon Tate who was a victim of the Manson family murders while she was pregnant.

Robbie was spotted in Los Angeles with the rest of the star-studded cast, however, all anyone can see is her massive pregnant stomach. One onlooker tweeted photos of the set, writing, "[email protected] on set of @OnceInHollywood set today! She will play pregnant Sharon Tate."

.@MargotRobbie on set of @OnceInHollywood set today! ???????? She is will be play pregnant Sharon Tate.
You can find 16 HQ photos in the gallery: https://t.co/LtidnjBAtP pic.twitter.com/8q6ETgyhIY

— Margot Robbie Hungary (@MargotRobbieHun) October 10, 2018

Robbie is playing Sharon Tate who was brutally stabbed 16 times while she was eight months pregnant with Roman Polanski's child. 'Once Upon a Time in Hollywood' is set to debut in August of 2019 on the 50th anniversary of the murder.