Pablo Larraín is set to direct and Kristen Stewart to play Princess Diana in Spencer, a drama that shapes up to be a hot package for the virtual Cannes Market. The Steven Knight-scripted film covers a critical weekend in the early '90s, when Diana decided her marriage to Prince Charles wasn't working, and that she needed to veer from a path that put her in line to one day be queen.

The drama takes place over three days, in one of her final Christmas holidays in the House of Windsor in their Sandringham estate in Norfolk, England. Production is expected to begin in early 2021.

The film will be produced by Larraín, director of films that include Jackie and Neruda, along with Fabula partner Juan de Dios, Jonas Dornbach, Janine Jackowski and Paul Webster. Knight's script work includes Eastern Promises, Peaky Blinders, Locke and The Hundred-Foot Journey.

While growing up in Chile didn't make Larraín as obsessed as many were in Diana and Charles' storybook wedding, or the endless coverage as their high-profile union was frayed by the pressures of fame and the crown. But he grew up reading fairy tales literature, and sees this as the antithesis of that trope.

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A new princess is coming to Hollywood. #KristenStewart has been cast as the late Princess Diana in 'Spencer.' Link in bio for all the details on the movie.

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The film won't deal with Diana's tragic death after she left that palace life, but will examine the fraying of the relationship with her husband, and her ferocious love for her sons Prince William and Prince Harry. Latter married actress Meghan Markle and made a decision similar to the one made by his mother while he was just a child.