It has finally been revealed what Kristen Stewart will look like as Princess Diana in the upcoming biopic, Spencer.

You won't believe your eyes when you see her transformation...

When the news dropped last year that Kristen Stewart was cast as Princess Diana in an upcoming biopic...

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People were stunned, to say the least.

Stepping into the shoes of the late Princess Di is a huge move...

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And many have had very little confidence in Kristen's ability to pull it off.

But now that filming is underway...

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​A sneak peek has just been revealed of Kristen in character as Diana, and it's certainly not what anyone was expecting.

Read on to see how the actress has transformed into the iconic princess...

Now, Princess Diana still has a hugely devoted fanbase...

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And they certainly aren't impressed with who's set to portray the much-loved princess. Let's start from the beginning...

It all started in 1977.

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At the young age of twenty, Lady Diana Spencer became Britain's obsession when it was revealed she was dating the future King of England, Prince Charles.

The pair married on July 29th, 1981, at St. Paul's Cathedral.

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The wedding, which today remains as one of the most infamous ceremonies in modern history, was watched by over 750 million people around the world.

And, soon after, the pair welcomed their first baby into the world.

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The pair announced their pregnancy just 4 months after tying the knot, and, on June 21st of 1982, they welcomed Prince William into the world.

Prince Harry arrived 2 years later on September 15th, 1984.

However, despite keeping up appearances, things weren't quite so content in the relationship between Charles and Diana.

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Rumors of Charles' infidelity were rife as the princess secretly battled with anxiety and a grueling eating disorder.

But, in spite of their marital difficulties...

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One thing Diana was absolutely dedicated to was being a mother. She had strong ideas about how she wanted her kids to be raised, often giving them more freedom than traditional royal heirs.

And, of course, Diana was known and loved for her extensive charity work.

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She was determined to use her massive platform to better the world and dedicated her life to many noble causes, including the land mine crisis. The princess shocked the world when she walked through a dangerous land mine zone in Cambodia, something no other royal had ever done in the past.

And it was this independence that was the likely factor in the breakdown of her marriage with Charles.

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On top of Diana's refusal to sacrifice her identity for the sake of her title, she and Charles also had a thirteen year age gap, which seemingly started to become a problem. Charles was also allegedly in a long-standing affair with Camilla Parker-Bowles, even wearing cufflinks she bought him on his honeymoon with Diana.

Charles and Diana eventually split in 1996.

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And, by 1997, Diana was dating business mogul and son of Harrods owner, Dodi Fayed. Many speculated that the relationship was controversial to the Royal family due to the fact that Fayed was a Muslim.

But on August 31st, 1997, tragedy struck.

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The car that the two were traveling in through the Pont L'Alma tunnel in Paris suffered a horrendous crash, which was fatal for both Diana and Dodi, plus their driver, Henri Paul.

The princess was tragically pronounced dead a few hours later.

Her death, understandably, shook the world.

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The totally unexpected nature of her passing, alongside the fact that she was such a well-loved public figure, made her death and funeral into something of a media circus.

Diana's funeral was televised and held on September 6th, 1997.

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It garnered viewing figures of over 32 million in the U.K, breaking all viewing records up to that point.

Millions more watched and mourned around the world.

But, fast-forwarding to today, Diana's memory is still very much alive.

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Her legacy and charitable efforts live on in her sons, William and Harry, and countless documentaries about her life in and out of the royal family have been released.

And, in 2013, a full feature film was made about the princess.

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Diana detailed the last 2 years of her life and revisited her affair with a Pakistani heart surgeon, with actress, Naomi Watts, taking on the crucial role of Diana.

However, the movie reviewed poorly, and critics branded the attempt at portraying the princess's life as "distasteful" and "awful."

So, many were shocked at the news of another movie about the princess being in the works last year...

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And they were even more shocked at the actress set to portray Diana.

It was confirmed last year that the biopic named Spencer will recreate the breakdown of Diana's marriage to Charles.

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According to reports, Spencer will be set at Sandringham and will detail the weekend in which Diana realized her marriage to Charles wasn't working. The film is scripted by Steven Knight, whose previous projects range from Peaky Blinders to Eastern Promises.

But the casting for the lead role of Diana was a little unexpected.

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It was confirmed that Twilight star Kristen Stewart will be the actress to portray the princess in the up and coming movie.

People weren't exactly impressed...

And Twitter became a complete minefield with people expressing their shock and distaste for the Spencer casting choice.

People just couldn't get over the news...

Admittedly, Kristen is an unexpected casting choice, but people are completely reeling.

Maybe it's because she's American, or the fact that she's covered in tattoos, or that she looks nothing like Diana... just a thought!

And others think that she is simply just too awkward.

Kristen's portrayal as Bella Swan was famously "awkward" and "rigid"... But was this simply a part of the character?

However, some people are confident that Kristen's acting abilities will enable her to expertly pull off the role...

And others have noted how she has that musing intensity that Diana became famous for.

The anticipation has certainly been brewing since Kristen's role was announced...

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But now, the moment we've all been waiting for has finally arrived... a sneak peek at Kristen in full character and costume as Diana on set!

And it's certainly divided opinion...

With many actually being pleasantly surprised!

But of course, many people weren't impressed with what they saw...

Well, here's Kristen in all of her glory as Princess Di...

What do you think? Do you think Kristen has pulled it off, or do you think it's not as amazing as you'd expect?