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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!”

From the patch to the porch, the celebs have been busy bees harvesting their big gourds and showin' off their mighty finds ... Y'all ready?! It's frigin' pumpkin time!!!

Fresh out of Oklahoma, Jennifer Garner is known for her gardening game -- recently hitting her family farm to gather some priceless pumpkins, while Spencer Pratt barreled his two towheads and scoped out the patch!

Presley Gerber must've picked somethin' up from his mom Cindy Crawford, as he totally kept it cool in Malibu, striking a pose in front of a ripe stack!

Internet star Avani Gregg looks like she hopped straight out of "Avatar" right onto your screens! Grab your makeup brush, and your magnifying mirror ... and see if you can smooth out the minor blemishes. (You might want to watch out for the sharp accessories)!

Known for her spooky and special effects makeup, Avani fully decked out in blue and busted out of her everyday shell for this "Avatar" look. Keep your eye on the prize and see if you've got what it takes to track down the switch-ups.

These bulky boys are battling it out!!! Lil Nas X and Chris Olsen both took their shredded bods to Instagram -- letting it all (almost) hang out -- but which sexy shot is doin' it for ya the most?

The question here is: Who'd You Rather?!

VOTE NOW!

Before this Texas native and cutie pie in pink turned into an American actress and singer, she was moving to Edgewood, Florida with her rents and lil' bro, and dressing up as her favorite princess for Halloween.

Contrary to her days as a princess, one of her most recognizable roles was playing a vampire, where she drank the blood of Ian Somerhalder's character. She also played the fantasy roles in "The Originals" and "Legacies."

Musically, this shining star released her debut album, "It's Always The Innocent Ones" back in 2006 and was a backup singer for Miley Cyrus in 2007-2008.

Halloween is THE day to dress up as whatever you flippin' want, so these celebs gave ode to their fave stars by fully dressing up as ... them! Take a scroll through the twinning pics ... This takes imitation to a whole new level of flattery!

Dwayne Johnson transformed his "rock" hard bod into David Beckham circa 2003, Drew Barrymore painted a nearly identical image posing as painter Bob Ross (hairy chest and all), and Kerry Washington scored gold in her Sha'Carri Richardson costume.

Yes you gotta master the wardrobe, but Rihanna showed her followers it's all about the pose too -- replicating rapper Gunna's day-to-day vibe.

Ice Spice is always a hot and popular choice among the stars ... Lil Nas X, Trisha Paytas and Eric Andre nailed the music star's iconic look!

American actress and model Jennifer Rubin was in her mid-20s when she became best known for playing the troubled asylum teen, Taryn, in the 1987 slasher sequel "A Nightmare on Elm Street 3: Dream Warriors."

Joining Jen on the big screen included Robert Englund as the undead serial killer, Freddy Krueger, Heather Langenkamp as the new intern at the Westin Hills Asylum, Nancy Thompson, and Patricia Arquette who was finally able to defend herself against Freddy as a Dream Warrior, Kristen Parker.

Other notable work includes her roles in "Bad Dreams," "The Doors" and "The Crush."

Before this lil' star with his sword was an international star, he was just throwin' on his tricorn, fighting his way to be a musician and growing up in England ... Arr you prepared to guess this matey?

Aside from his superior singing skills, he's written songs for some of music's hottest stars like The Weeknd, Taylor Swift and Justin Bieber -- whom he's also collab'd with vocally, but perhaps you don't care.

One of his top songs is a popular and perfect wedding song.