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Have you ever wanted to be a Harry Potter star? Now's your chance.

J.K. Rowling's series helped catapult the careers of Emma Watson, Daniel Radcliffe and Rupert Grint - and she's on the lookout for the next breakout witch.

On Saturday - TOMORROW, exciting times! - there will be an casting call for Potter spin-off Fantastic Beasts And Where To Find Them, and it could be your big break.

Warner Bros will be hosting open auditions at the Excel Centre in London for girls aged between eight and 12 to play the character Modesty.

"Modesty is a haunted young girl with an inner strength and stillness," the company said in a statement. "She has an ability to see deep into people and understand them."

(Image: Getty)

The young girl chosen by casting directors will go on to perform alongside Oscar-winner Eddie Redmayne in the blockbuster, which is expected to be released next year.

Writing on her Facebook page in 2013, JK Rowling, who has already penned the screenplay for her 2001 book, said: "Although it will be set in the worldwide community of witches and wizards where I was so happy for 17 years, Fantastic Beasts and Where to Find Them is neither a prequel nor a sequel to the Harry Potter series, but an extension of the wizarding world.

"The laws and customs of the hidden magical society will be familiar to anyone who has read the Harry Potter books or seen the films, but Newt's story will start in New York, 70 years before Harry's gets under way."

All young girls interested in the role of Modesty have been asked to start queueing for auditions from 9am on Saturday.

Fantastic Beasts and Where to Find Them is set to hit cinema on 18 November 2016.