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In a recent interview with The Hollywood Reporter, Eric Roberts, who plays Robbie's character's father in the upcoming Damien Chazelle-directed movie, said that the 32-year-old actress "gives the most incredible performance" in Babylon as he spoke about his own prolific acting career.
Asked whether he actually watches his own movies, 66-year-old Roberts — brother to Julia Roberts and Emma Roberts' father — admitted he doesn't usually watch his own performances anymore before clarifying that he has seen Babylon.
"I will also tell you that Margot Robbie is going to win an Academy Award for that," Roberts told THR. "She gives the most incredible performance in Babylon that I have ever seen."
The actor compared Robbie's performances to the "perfect performances" of Elizabeth Taylor and Sandy Dennis' in the 1966 film Who's Afraid of Virginia Woolf? in praising his costar, noting Robbie's acting in Babylon is "on that level."
"She blew me away," Roberts added. "I couldn't believe how brilliant every minute of every day she was."
"I'm a masochist," she told the magazine.
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In Babylon, Robbie stars as an aspiring actress named Nellie LaRoy in 1920s Hollywood, when the movie business was transitioning from silent films to talkies. Brad Pitt plays Jack Conrad, a movie star at a different stage of his career.
According to a recent report from Variety, Babylon has a total runtime of 3 hours and 8 minutes.
This will be the Oscar-winning director's longest film yet: 2014's Whiplash is 106 minutes, 2016's La La Land is 128 minutes, and 2018's First Man is 141 minutes.
The film is, according to an official synopsis, "a tale of outsized ambition and outrageous excess" that "traces the rise and fall of multiple characters during an era of unbridled decadence and depravity in early Hollywood."
Babylon's cast also includes Diego Calva, Jovan Adepo, Li Jun Li, Tobey Maguire, Max Minghella, Lukas Haas, Olivia Hamilton, Rory Scovel, Katherine Waterston, Flea, Jeff Garlin, Eric Roberts, Ethan Suplee, Samara Weaving and Olivia Wilde.
Chazelle previously told Vanity Fair this film is "definitely the hardest thing I've done." He explained, "Just the logistics of it, the number of characters, the scale of the set pieces, the span of time that the movie charts — it all conspired to make it particularly challenging, but it was a challenge that was pretty exciting to take on."
Babylon is in theaters Dec. 23.