You might consider yourself a huge Harry Potter fan - and you might have watched all the movies several times - but we bet there's a couple of famous faces on this list who you might have missed.
To be fair, several of these people only became well-known after the movies were released, so it's to be expected that most of us wouldn't have recognised them the first time we watched.
However, if you've been re-watching Harry Potter recently, you might have hit pause when some of these people popped up.
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Of course, they're much younger in the movies than they are now, so they're pretty hard to spot.
Did you see any of these famous actors, singers and TV presenters?
Tom Ackerley
Tom was just a child when he appeared in The Prisoner of Azkaban - and if you didn't recognise him, don't feel bad.
Even wife Margot Robbie - who is pregnant with their first child - didn't realise until after they tied the knot, despite being a huge fan.
While appearing on The Graham Norton Show, Margot said: "He was an extra. When he was a little kid, he was one of the Slytherin extras.
"When Draco pushes some kids out of the way to see Buckbeak in the third book, he pushes my husband out of the way."
Dani Harmer
Tracy Beaker was in Harry Potter?
Yep.
In the very first movie, Dani Harmer played an extra - a Gryffindor student - sitting next to Fred and George in the Great Hall.
The scene was discovered by a fan on X who wrote: "I think I found @DaniHarmer in Harry Potter and the Philosophers stone, she is behind Oliver Wood after Hermione speaks."
Dani replied, confirming: Yep there I am xx."
Jesy Nelson
Former Little Mix star Jesy Nelson appeared very briefly in Harry Potter and the Goblet of Fire, in the Yule Ball scene.
Chatting to an Australian radio presenter a few years ago, Jesy explained you can see the moment if you press pause.
“I was in Harry Potter! I’ve been in a few others, including About A Boy with Hugh Grant. You can actually see me if you pause the tape," she said.
Regé-Jean Page
Before he was Simon Basset, Duke of Hastings in Bridgerton, Regé-Jean Page appeared in the seventh Harry Potter film - Deathly Hallows Part 1.
He can be seen standing behind Hermione during Bill and Fleur's wedding.
Speaking about the moment on The Tonight Show, he explained: “I mean, the best thing about background acting, particularly on big movies like that and I recommend it to every actor out there – is essentially, no one pays attention to you in the background, so you get to be the best actor spy.”
Ben Shephard
You might be surprised to learn that Good Morning Britain's Ben Shephard also made a cameo appearance in Harry Potter.
Disguised behind a beard and long hair, Ben appeared in a scene in the Half-Blood Prince.
"I rarely talk about it, as you know Laura, but I had a part," Ben told GMB's Laura Tobin.
"But the exciting thing was that I thought it would be a good thing to have a moustache. It really wasn't - it's the most irritating thing in the world."
Topics: TV and Film, Harry Potter, Celebrity
Lucy Devine