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It's the spookiest time of year, with celebrities donning frighteningly creative Halloween costumes.

Did any stars dare to dress as Barbie despite the SAG-AFTRA ban? And who topped Diddy's Joker, Kim Kardashian's Mystique and Heidi Klum's human-sized earthworm from last year?

The stars are always thinking outside the box for the holiday, but some may have had plans foiled this year.

Earlier this month, SAG-AFTRA announced that striking actors, now well past 100 days in, are prohibited from wearing costumes inspired by major studio content. The guild asked strikers to wear generalized Halloween costumes, like witches, fairies or zombies.

The guidelines did not clarify whether you could dress up as characters from movie studio-adapted content such as Mattel's Barbie or Nintento's Mario, but it appears actors largely opted to be safe rather than sorry. 

Here are some of the Halloween costumes celebrities have brewed up this season.

North West channels dad Kanye West

Kim Kardashian and Ye's oldest child North West, 10, paid homage to her father over the weekend.

In TikTok videos shared via Kardashian and West's joint account, the 10-year-old dressed up with a bear head and a varsity jacket, resembling the character on Ye's album covers for his 2004 debut "The College Dropout," 2005 sophomore album "Late Registration" and 2007 album "Graduation."

West danced to Ye's songs "Can't Tell Me Nothing" and "I Wonder" as well as Estelle's "American Boy," to which the rapper contributed verses.

Paris Hilton as pop stars Britney Spears and Katy Perry

Paris Hilton is paying homage to her superstar peers this Halloween.

To kick off the weekend, Hilton attended the annual Casamigos Halloween party on Friday as none other than her friend and popstar Britney Spears. The socialite and entrepreneur donned a blue flight attendant dress as a tribute to Spears' "Toxic" music video.

"Icons support icons 👑," Hilton captioned a post on Instagram.

Hilton dressed up as another famous popstar on Saturday. "Halloween Round 2 as another one of my iconic Queens @KatyPerry," she captioned photos on Instagram.

The costume was of Katy Perry's mushroom outfit that she wore during her Play residency at Resorts World in Las Vegas in 2021 and 2022.

Megan Fox defies SAG-AFTRA rules in 'Kill Bill' costume

Megan Fox and Machine Gun Kelly attended Casamigos' annual Halloween party Friday as Beatrix Kiddo and Gogo Yubari from "Kill Bill," respectively.

As an actress, the move goes against the SAG-AFTRA guidelines.

Fox boldly tagged the union on Instagram as she shared photos of her costume.

Ice Spice sizzles as Betty Boop

Ice Spice is "In Ha (vintage) Mood."

The rapper dressed up as cartoon vamp Betty Boop for Halloween, showing off Boop's signature red minidress and black curls on Instagram.

"guess who," the "Princess Diana" emcee captioned the post.

Adele plays Vegas residency dressed as Morticia Addams

Adele brought the spooky to Sin City.

The British pop singer went the gothic route with her Halloween look, dressing up as Morticia Addams from the dark family comedy "The Addams Family." The "Easy on Me" songstress even hit the stage in her Addams garb for her Las Vegas residency.

"Weekend 33," Adele wrote on Instagram.

Chloe Bailey as Daenerys Targaryen

Chlöe went all out as "Game of Thrones" character Daenerys Targaryen. "I am Khaleesi, the Mother of Dragons," the "Have Mercy" singer captioned her photo on Instagram.

She posted several photos in a gold, skin-baring warrior outfit, long blonde wig and gold heels posing with dragon egg props on a castle set.

SZA was a fan, commenting, "GAGGEDDD" while her sister, Halle Bailey, gave her approval by commenting, "love this!!!!!"

Halle Bailey, boyfriend DDG pay homage to Janet Jackson and Tupac Shakur

Halle Bailey is giving fans another remake of a cinematic classic this Halloween, and the results are fly. "The Little Mermaid" star and her boyfriend, rapper DDG, dressed up as Janet Jackson and Tupac Shakur's characters from the 1993 film "Poetic Justice."

Bailey was Jackson's doppelgänger in a demure, all-black ensemble, while DDG donned a baseball jersey and green cap in tribute to Shakur.

"poetic justice, put it in a song," Bailey captioned the Instagram post.

Vanessa Hudgens has Halloween-themed bachelorette party

Vanessa Hudgens, who is engaged to baseball player Cole Tucker, celebrated Halloween with a spooky bachelorette party.

The "High School Musical" star shared pictures from the "most iconic bachelorette weekend" in Aspen, Colorado, including a spooky theme night where the actress wore a lacy light-colored dress, a celestial headband and matching veil with a heart stitched in between her and her fiancé's initials.

Guests donned black dresses, including "Modern Family" star Sarah Hyland, "Barbie" actress Alexandra Shipp and sister Stella Hudgens.

Kendall Jenner channels old Hollywood glamour as Marilyn Monroe

Icons are a girl's best friend.

Kendall Jenner transformed herself into film icon Marilyn Monroe for a glamorous Halloween look that saw the model and reality-TV star rock a black turtleneck sweater with a curly blonde hairdo.

"happy birthday mister president," Jenner wrote on Instagram, referencing Monroe's famous birthday performance for President John F. Kennedy in 1962.

Kelsea Ballerini as cowgirl Barbie

Country singer Kelsea Ballerini got the holiday started early, hosting a treat-filled Halloween costume party with The Original Donut Shop Coffee at Beauty & Essex in New York City on Wednesday.

The "If You Go Down (I'm Goin' Down Too)" singer, who was recently honored at Time 100 Next Gala, dressed as cowgirl Barbie for Halloween.

Kourtney Kardashian recreates sister Kim Kardashian's Met Gala maternity look

Sisterly spats come and go, but high fashion is thicker than blood.

Despite her tumultuous relationship with sister Kim Kardashian, a pregnant Kourtney Kardashian paid tribute to her sibling by recreating the now-iconic floral-printed dress Kim wore to the 2013 Met Gala when she was pregnant with daughter North West.

"Freaky Friday," Kardashian wrote on Instagram.

Lizzo pays tribute to late Tina Turner

For Lizzo, Halloween homages are reserved for "The Best."

The "About Damn Time" singer paid tribute to rock icon Tina Turner, who died in May, on Instagram with a bedazzled black dress reminiscent of Turner's style.

"Honoring Tina Turner," Lizzo captioned the post.

Keke Palmer recreates Tyra Banks' 'Life-Size' character

Move over, Barbie. Eve is back in town.

Keke Palmer dressed up as doll turned real-life glamazon Eve in tribute to the 2000 fantasy comedy "Life-Size," which starred Lindsay Lohan and Tyra Banks as Eve. Palmer looked modelesque in a blue-and-black, mermaid hem dress.

"I’m the real thing, now I’m a DOLL. 🎃," Palmer wrote on Instagram.

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