Kristen Stewart breaks down in tears as Princess Diana in first Spencer trailer

Kristen Stewart channels Princess Diana with aplomb in the first trailer for Spencer, an upcoming biographical drama about the beloved royal.

The movie is set in 1991 and takes place over the Christmas holiday as Diana (born Diana Frances Spencer) grapples with the decision to end her marriage to Prince Charles.

First-look photos of Stewart as Diana have set the internet ablaze, but film fans had been eagerly waiting to hear the American actor's take on Diana's British accent. Yet it appears the companies behind Spencer, Neon and Topic Studios, want to keep people guessing since Stewart only utters two words in the minute-long trailer.

"They know everything," Sally Hawkins, who plays an undisclosed role that appears to be a confidant to the Princess of Wales, tells Diana. She responds: "They don't".

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Despite the minimal dialogue, the teaser offers a captivating glimpse into the extravagant life at the Queen's Sandringham Estate, one that includes lavish meals and stunning attire.

In the footage, Stewart, dressed to the nines at all times, becomes increasingly emotional as she grapples with rumours of affairs and evades ruthless paparazzi.

Spencer, directed by Jackie filmmaker Pablo Larrain, isn't entirely true-to-fact, but rather serves as an imagining of what might have happened during that fateful holiday period.

English actor Jack Farthing is starring alongside Stewart as the heir apparent to the British throne.

The cast also includes Olga Hellsing as Sarah, Duchess of York; Amy Manson as Anne Boleyn; and Niklas Kohrt as Prince Andrew.

Peaky Blinders creator Steven Knight wrote the screenplay for Spencer, which is set to be released in Australian cinemas on January 26, 2022.