Now, for many of us, the Harry Potter books are a cornerstone of our childhood.

The books, the first of which was published in 1997, are some of the most popular children's novels of all time.

There are 7 Harry Potter books in total...

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And writer, JK Rowling, managed to build an incredibly immersive (and oddly believable) fantasy world, wherein magic seemed like it could really exist.

But the books weren't at all where it ended.

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The massively successful series was adapted for the big screen by Warner Brothers. There are now 8 incredible movies in the original Harry Potter canon, the first of which came out in 2001.

The stories revolve around 1 central character, of course.

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The eponymous hero, Harry Potter, is a young wizard who has been orphaned and kept shielded from the world of magic until he receives a mysterious letter.

Until reaching the age of eleven, Harry lived with his aunt and uncle.

They were non-magical folk, known in the books as Muggles, who treated Harry very poorly and even forced him to live in a cupboard under the stairs.

But Harry receives a letter that changes everything.

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He finds out that he's actually a wizard and has been accepted to study at Hogwarts School of Witchcraft and Wizardry to hone his craft.

While there, Harry learns a wide variety of magical spells.

But what makes the Harry Potter universe so immersive is how oddly believable all these magical aspects seem when you're reading (or watching).

As the books and movies go on, they quickly take a very dark turn and introduce Harry's enemy.

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The Dark Lord, named Voldemort, is both an evil wizard and a personification of everything that's wrong with the wizarding society. The overriding story of the books is Harry ultimately taking on this foe.

But, of course, Harry can't do this alone.

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Along his journey through school, he makes 2 best friends, Hermione Granger and Ron Weasley.

Both of these pals added strength to Harry in his battle.

Hermione has an almost encyclopedic knowledge of the world of magic, and there's essentially no spell that she can't do. But it's Ron who quickly became a true fan favorite, thanks to his unshakeable loyalty and top sense of humor.

The casting of these 3 leads is often pointed to as a big reason behind the franchise's success...

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And those actors were Daniel Radcliffe as Harry Potter, Emma Watson as Hermione Granger, and Rupert Grint as Ron Weasley.

Many Harry Potter fans feel as though they've grown up with these stars...

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Because they all first appeared in the original movie in 2001, and continued in their roles for a whole decade, until the final film was released in 2011. And since the final movie, all cast members have been pursuing their own exciting ventures in Hollywood and showbiz.

Sadly, however, one of the former cast members has had some heartbreaking news this week.

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Her baby son has been rushed to hospital. After reading the heartwrenching post, messages came pouring in...

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Jessie Cave, who shot to fame playing Lavender Brown, shared the news that her 3-month-old son, Abraham, had been taken to hospital.

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Jessie welcomed Abraham in October, where spent he spent the first days of his life in the neonatal unit following her "terrifying and humbling" pregnancy, before being discharged in November.

But, that same month, Abraham fell ill.

The 3-month-old had tested positive for the new strain of coronavirus.

Jessie took to her Instagram to update fans.

"I watched the news about lockdown from an isolated room in hospital. Poor baby is covid positive. "He's okay and doing well but they are being vigilant and cautious, thankfully."

"This strain is super powerful and contagious so I do hope that people take extra care in the coming weeks."

"Really didn't want this to be the start of my families new year. Really didn't want to be back in a hospital so soon after his traumatic birth. "Once again I'm in awe of nurses and doctors. It makes me even more proud of my brother, a&e doctor, and my father, king GP..."

She then asked fans for well wishes for her baby.

"Please wish baby a speedy recovery. He's 9llbs 7 now so he's a stronger and bigger boy than he was when we were last in a hospital room (and the needle went into his hand with louder more powerful screams) Love and best wishes to everyone." We hope Abraham makes a speedy recovery! For more celebrity baby news, scroll on...