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Before they were superstars, these adorable kiddos loved dressing up for Halloween, but can you tell who these celebs are -- back before they were in front of the flashing lights?

Demi Lovato, Kendall and Kylie Jenner and Ethan Slater are just a few of the lil' tykes who sported a cute costume back in the day -- but good luck guessing which one is them!

This actress is known for her thrilling work in horror movies ... some may even deem her as the ultimate "scream queen!" But is this witchy gal who you think it is?

Even as a dressed-up princess, this singer couldn't "ignore the crazy visions of her living in LA" one day ... Can you guess who she is?

Celeb pet-parents can't hog all the fame, likes and candy; especially when their furry kids in Halloween costumes are just so cute and dandy! Today's spotlight is on the animals, so grab your treats; these four-legged stars have earned 'em!

Ready and "Hot To Go", Antoni Porowski dressed his fur-baby as Chappel Roan, while Ariel Winter managed to costume all her precious pups, and guess which celeb turned their lil' bulldog into a chili-dog?!

Before the clock strikes midnight tonight and the Halloween shenanigans commence, we're heading to Salem, Massachusetts and shouting out a spooky classic starring many Hollywood greats: The 1993 family/comedy film, "Hocus Pocus!"

The Sanderson Sisters -- played by Bette Midler, Sarah Jessica Parker and Kathy Najimy -- were 3 witches resurrected from the 1600s after the Black Flame Candle was lit by high schooler, Max Dennison (played by Omri Katz).

The town's kids were in danger of being sucked by the Sanderson Sisters' life potion. Max, along with his younger sister Dani (played by Thora Birch) and his high school crush Allison (played by Vinessa Shaw), were on a mission to stop the Sanderson Sisters at last!

Celebs in costumes always hits different, 'cuz when it comes to Halloween there's no stoppin' these stars from going all out! Sometimes however, they select the same look and it gets real tricky real quick! So, we've gotta ask -- Who'd You Rather?!

It's a given Paris Hilton and Megan Thee Stallion are both classy n' bougie, but which Sailor Moon are you choosing to rock your world?!

Beetlejuice, Beetlejuice! Celeb couples, Travis Barker and Kourtney Kardashian AND Maggie Lindemann and Jordan Clarkson dressed to impress ... but which duo hit the spooky 1988 classic out of the park?

It's a "Snow White" showdown between Avani Gregg and Charli D'Amelio ... if you had to choose one gal to hold your apple, who's it gonna be?!

Forget the naysayers and cut the cat-itude! ... stumbling upon a black cat is GOOD luck, and lucky for you ... we've got all the stars dressed up as black cats for Halloween. Check out gallery and see who's lookin' good and feline fine!

Before this cute festive kid with face paint turned into an American YouTuber and singer, he was just 15 years old, starting his YouTube channel, before heading off to Hollywood to start his entertainment career.

While his early content consisted of baking and his everyday life in small-town Texas, he now has garnered millions of views, like his "Heather" music video, which has over 172 million views.

He's a known "Swiftie," and when he dropped his "Kid Krow" album, he got a personal shoutout from none other than Taylor herself!

"There must be some Clovers hot shots in the atmosphere," because Gabrielle Union is celebrating her 52nd birthday today, and we've got her sexiest snaps ... EVER! Honor this hot mama's bday with our smokin' hot gallery!

The celebs are always providing inspo, so grab your fake blood, because it's a blood bath in Hollywood and the celebs are showin' out with some major drippage! These bloody pics may make you squeamish ... scroll slowly!

Double thumbs up for Sydney Sweeney who doused herself in some flake blood, Finneas better watch out, because his girl Claudia Sulewski has got a bloody hammer and she ain't afraid to use it!

Keepin' it the fam, Billie Eilish snapped a creepy selfie, showing a gashed nose and a slashed cheek, but not to worry: those "Ocean Eyes" were still intact!

And you better "get out, leave" before Jojo and Nicole Scherzinger end you and it's "too late"!

It's the time of year where even Hollywood A-listers wanna be someone else -- with many of them throwing on makeup and donning costumes for Halloween week!

With Halloween on Thursday this year, many celebs decided to dress in their scariest, silliest and sexiest costumes this weekend ... like Selena Gomez and Benny Blanco, who went down the rabbit hole with their "Alice in Wonderland" costumes.

Sophie Turner and Ice Spice wore outfits inspired by '90s movies ... with Sophie looking like Trinity from "The Matrix" and Spice dressed as Leeloo in "The Fifth Element."

Nearly three decades after Wes Craven's 1996 release of "Scream" -- the horror film surrounding a group of Woodsboro High School students, plagued by a harrowing serial killer -- is still a top scary movie amongst many generations.

A few of the breakout stars include Skeet Ulrich as Billy, Neve Campbell as Sidney, Matthew Lillard as Stu, Rose McGowan as Tatum and Jamie Kennedy as Randy.

It all began with Drew Barrymore's infamous over-cooked popcorn scene and a haunting phone call that ended with a "scream" that came a squeak too late ... And, of course accompanied by some eerily creepy, suspenseful music.

Just two years into her run on "Friends," Courteney Cox took on the role of Gale Weathers -- the hot and thirsty tabloid journalist who falls for the town's police officer, Dewey ...

Werewolves, vampires and other ghouls are sure to come out on Halloween night ... but, Saturday was all about dogs -- with costumed creatures taking over Toronto.

The Howl'oween Festival at a shared space in the city known as The Bentway took place this weekend ... with local vendors hawking pet-related goods, prizes for pups who compete in the costume contest -- and, many dogs ready to strut their stuff.

Check out this rambunctious rottweiler ... dressed in a classic devil outfit -- looking ready to snap up some of the devilishly good treats the event had to offer.

Who's ready to carve out some fun into their day and create the dopest pumpkin-carving masterpiece?! Halloween is just days away ... it's time to start slicin' n' dicin'!

There's no need to freak out over decorating your stoop ... TMZ has got you covered with all kinds of celebrity stencils WHOOP WHOOP!

You can kick all your neighbor's creations to the curb ... cut out this year's hottest stars who've been topping your feeds all year long, including Sabrina Carpenter, Simone Biles and Adam Sandler.

Disguised in this crazily-altered photo is a celebrity couple who take it all the way back to the year 2000 ... Given the following clues, see if you've got what it takes to unscramble the unknown duo!

They first met working together on a slasher film, and as spooky as it sounds: you better watch out, because they know know what you did last summer! These hot parents have two kids and recently enjoyed date night, posing in front of Haunted Mansion Holiday at Disneyland Park.

Need one more clue? “Scooby Doobie Doooo!”