Can you guess them all? (Picture: Getty/Backgrid/Instagram)

Happy Halloween, everyone!

Ah, All Hallows Eve – the spookiest night of the year has finally arrived. The clocks have gone back, the nights are turning darker, and people from your local estate are going to be knocking on your door from 6pm onwards.

On the flip side, it’s the one night per year when you and two of your friends can go out dressed as a Ghostbuster, a witch, and Sandy Olsson from Grease and have nobody question why.

Strictly Come Dancing got in the scary mood with a full line-up of scary costumes and dress-up, Bake Off did Halloween week very recently, and it seems many celebrities have gone the extra mile with their outfits this year as well.

So, before you head outside into the cold for a Trick or Treat session tonight, why don’t you try to guess who’s behind the mask?

Let us know your scores in the comments!

1. Who’s that under the hat?

Winnie Harlow leaves a Halloween party, but who is she with? (Pictures: ALEXJR / BACKGRID)

Winnie Harlow was spotted leaving a Halloween party dressed as a glamorous Egyptian queen, but who was her partner at the party?

Whoever they are, they sure know how to assemble a Hot Indiana Jones costume. Not that Indy wasn’t already hot – I mean, come on, it’s Harrison Ford!

When the photographer asked the pair to smile for the camera, Indiana clearly had other ideas. His decision to hide his face means he features in our quiz, though, so thanks for that, Indy!

2. Who’s the Barbie in the Box?

Who came out on Halloween night as Barbie in a box? (Picture: Michael Kovac/Getty)

A lot of people see Halloween as the perfect opportunity to relive their childhood, or at least dress up as a beloved toy they once had.

And more power to those people!

So who turned up to a big Halloween party as Barbie, still fresh from the shop and not even out of her box yet?

3. Here’s an “Extra” costume

ET probably phooooned the cab he arrived in at the Halloween bash (Picture: LESE/RMLA / BACKGRID)

Sorry, if you don’t know the answer to this one you’re not allowed to phone home, or phone a friend, or use your phone to Google the answer.

We’ll give you a little clue: the person under the mask of the adorable alien is an American rapper who once had a hit with a member of N-Dubz.

That’s all the help we’re giving you, though!

4. Who’s this Poor Unfortunate Soul in Soho?

It’s a fantastic costume, but who’s the one wearing it? (Picture: Mattpapz / BACKGRID)

Ursula, the evil mastermind from The Little Mermaid, is a popular choice for Halloween costumes up and down the land year on year.

While attending a Halloween party in Soho, one familiar face, who you know you’ve seen recently but just can’t place(!), donned the classic purple and black garb.

But who is it?

5. This one’s too easy, isn’t it?

Go on, you can have this one for free – we’ll treat you rather than trick you (Picture: John Phillips/Getty)

We’ve basically given you a free point here, haven’t we? We could have picked a photo that was much harder solve but we’ve been kind enough to give you one for free.

Imagine that you taking this quiz is the same as you going Trick or Treating later on. You’re outside Metro.co.uk’s house and we’re just throwing you free sweets for now. The rest get pretty tough from here, though, so you’ve been warned.

6. Who’s the Bad Grandma?

Jackass’ Bad Grandpa is almost 10 years old now but stars are still paying tribute to it (Picture: justinpalmer_ldn / BACKGRID)

Jonny Knoxville’s Bad Grandpa is one of the many entries to the Jackass stunt comedy series – who dressed up as that character this year?

7. Blood and baseball bats

A bizarre pairing that doesn’t seem to have a theme – but the costumes are great regardless! (Photo by Ricky Vigil M/GC Images)

It’s blood spatters, rusty baseball bats, and gorgeous red gowns for these two. But who are they? We’ll give you a small hint: they are a celebrity couple.

As for who their costumes are, we’re stumped. There’s a chance one of them could be Thurman from 1979 cult horror movie The Warriors?

We’ve also noticed in the background that someone appears to have turned up as a murderous clown. See if you can spot them.

8. Pirates of the Coffee-Beanin

From the Caribbean to her local coffee shop – who is this famous face? (Picture: Instagram)

Ah, here’s a great costume that’s a little out of the left-field. Calypso, daughter of the sea god Atlas, who first appeared in Dead Man’s Chest.

But who’s under all that excellent make-up and hair, and the absolutely glorious embroidery and sewing work? This is our favourite costume of the lot.

9. Is it the answer you’re looking for?

Who sported this iconic Lionel look during the Halloween celebrations this week? (Picture: Instagram)

This is another stellar look from the Halloween celebrations over the weekend.

Lionel Richie donned this iconic get-up on the front cover of his debut album in 1982 – it was a look that became synonymous with all his hits thereafter.

But who’s doing a fantastic impression of him here?

10. Feeling (sky) blue

Sporting a short sky blue dress and huge black platform shoes, it’s… (Picture: TPG/HEDO / BACKGRID)

We’ll try to keep the information a little thin on the ground for this one because, let’s be honest, you can see her whole face and she’s not disguised as any character in particular.

Let’s just say that, on nights as spooky as Halloween can be, she might ask you to (ahem) hold her hand just to feel that extra little bit safer… Hopefully that hasn’t given it away. We do want to test you with these!

11. Poking fun at your own age gap

That’s one way to make fun of an age gap in your relationship! (Picture: Alberto E. Rodriguez/Wire)

This next costume features a celebrity couple who were married earlier this year – their marriage drew quite a lot of attention because she’s 28 and he’s 49.

And, well, I suppose if you’re going to poke back at people who’ve said the age gap in your relationship is too big, then this is the way to do it.

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Happy Halloween!