A "Harry Potter" theory was just confirmed in the new trailer for "Fantastic Beasts: The Crimes of Grindelwald."

It's now official that Claudia Kim's character is the same Nagini who later becomes Lord Voldemort's snake Horcrux.

Fans got their suspicions up when it was revealed that Kim's character was a Maledictus, which denotes a person whose blood had been cursed from birth leading them to eventually turn into a beast.

Claudia Kim talked to Entertainment Weekly about her character, showing emotion when she was finally able to confirm that she's playing the famous HP character Nagini:

Kim told EW that, in the second film's storyline of 1927, Nagini "feels this pressure that the clock is ticking" because at some point she will be permanently transformed into a snake.

And while Potter fans know Nagini as Voldemort's closest ally -- who kills Snape and is killed by Neville -- this film will show the real woman behind the curse:

"You’ve only seen her as a Horcrux. In this, she’s a wonderful and vulnerable woman who wants to live. She wants to stay a human being and I think that’s a wonderful contrast to the character."

In "Fantastic Beasts 2," Nagini is basically the only friend of Credence Barebone (Ezra Miller), who has run off and joined the circus.

"It’s amazing these two broken souls are able to form some kind of friendship within the circus," Kim told EW. "Credence is special to her because he encourages her to use her power.”

Harry Potter author and "Fantastic Beasts" screenwriter J.K. Rowling has been answering questions, and teasing out more information, on Twitter:

A bigger shock is coming for Ezra/Credence?! Interesting...

Here's more intel on Nagini from the Harry Potter Wiki:

"Nagini (d. 2 May, 1998) was a previously Human Maledictus with the ability to transform into a snake. During the 1920s, she was a performer at the Circus Arcanus where she met Credence Barebone. By the 1990s, Nagini, seemingly trapped in snake form, belonged to Lord Voldemort, with whom she had a special bond largely due to becoming a Horcrux, after her master had killed Bertha Jorkins in 1994.

After Voldemort's initial downfall, he used Nagini's venom as one of the ingredients for a Potion in order to regain strength, which eventually led to his Rebirth. In 1995, she attacked Arthur Weasley, but he managed to survive. During the Second Wizarding War, she had to be destroyed in order for Voldemort to be finally defeated. Nagini was killed by Neville Longbottom with Godric Gryffindor's Sword in 1998, and was the last Horcrux to be destroyed."

Warner Bros. recently issued character posts for stars Eddie Redmayne, Katherine Waterston, Dan Fogler, Alison Sudol, Ezra Miller, Jude Law, Johnny Depp, and Callum Turner. EW also added Claudia Kim's to the list:

"Fantastic Beasts: The Crimes of Grindelwald" opens in theaters November 16.

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