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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.

These hot Hollywood couples have stepped out of their everyday garments and are rockin' some adorable and almost too hot to handle Halloween Costumes! They came to slay, but can you nail down the unknown duos in this fun game of "Guess Who?!"

Take a swipe through our gallery and peek-a-boo at which cute couples absolutely crushed their spooky lewks. Can you can guess which celeb duo is on top of their costume game?

Come with some celeb knowledge and guess to impress as you embark on some crazy-cuteness. Keep both eyes peeled and you will be treated (or tricked) by some classics like Woody and Bo Peep, Albus and Remus, and an A-list singer dressed as a pickle with her man ... they're kind of a big dill!

American actress Gillian Jacobs was in her mid-20s when she first started playing Britta -- the smart and progressive hipster with a group of friends at Greendale Community College -- in the sitcom "Community" back in 2009.

Britta was part of an ensemble cast including Joel McHale as the former defense attorney going back to school and leader of the friend, Jeff, Donald Glover as the sensitive and goofy friend who cares deeply for his peers, Troy, and Alison Brie as the optimist gal -- super dedicated to her school, Annie.

Khloe Kardashian turned her Calabasas home into a Halloween pumpkin palace for the annual cousins' pumpkin party -- totally decking out her digs! Khloe brought the spooky vibes and flooded her home with big ole' balloons, goodies n' treats and pumpkins out the wazoo!!!

Of course, Kris Jenner (aka "Lovey") was in attendance -- seen showing off her sexy Snow White costume ... and Khloe's besties, Natalie Halcro and Olivia Pierson, joined in on the festivities and rocked some cat ears.

Khloe snapped a sweet selfie with her kiddos, True and Tatum, all sporting cozy skeleton onesies.

The KarJenners are taking over the film world ... not only is Kim flexing her acting chops these days -- they're also lighting up the red carpet at the Academy Museum Gala!

Kim, Kylie Jenner and Kendall Jenner hit the red carpet at the glitzy affair -- nicknamed the "Met Gala of the West" -- in their updated take on Hollywood glam ... stylish dresses showing just a little more skin than Ava Gardner might've.

Check out the ensembles ... Kim's putting on a leggy display in an all-white dress with no coverage of her legs -- while Kylie went with a flesh-colored top and Kendall wore a black cocktail dress.

Before this sweet boy in his proper baby outfit turned into a socialite and real estate agent, he was just roaming the halls of the Waldorf Astoria, attending elite schools and growing up with two older sisters and one younger bro.

You may hear or read more about his two famous sisters, as he's more low-key, but he still cashes in on his real estate earnings. He has 3 children -- welcoming his 3rd earlier this year with wifey, Tessa.

Need another clue? His last name is a famous Hotel chain ...

Kim Kardashian's been serving up looks ever since she and her famous fam broke onto the scene circa the mid-2000s, but it's no secret Kim takes the (bday) cake when it comes to Halloween 'fits!

And since today marks this billionaire's 44th birthday, we've assembled her most iconic and hottest Halloween looks throughout the years ... Like this throwback from 2008; check out a (then) 28-year-old Kim K. as a voluptuous Wonder Woman!

Flashback to 2012 when Kim took Miami by storm and put her Cat Woman physique on blast for her Halloween party at Fontainebleau's LIV nightclub.

Grab your popcorn, because inside this popular pumpkin head is a Houston, Texas gal known to put on one hell of a show! She recently took the mic as Britney Spears, so 'you better work' and come correct to unveil this scrambled celeb!

You can almost guarantee she's having a Hot Girl Fall -- recently going knuckle deep in some popcorn -- while slaying a jack-o-lantern on top (her Halloween go-to trick). Your ratchet may help loosen up this rappin' pumpkin.

Her songs may be savage, but that doesn't stop them from going viral ...

Anna Kendrick's looks over the years are picture-perfect!

Here is a 27-year-old version of the Hollywood actress showin' off her loose curls and pearly whites at the premiere of "Pitch Perfect" back in 2012 (left). This was a few years after her Academy Award nomination for her 2009 "Up In The Air" performance.

And, 12 years later, the stunning star recently took her wavy hair to the "Woman of the Hour" premiere in Hollywood (right) -- which hit Netflix earlier this weekend. In addition to starring in the film, this is Kendrick's directorial film debut.

You already know her "Pitch" is on the money, so the question here is: