Halloween is the perfect time for fans worldwide to transform into their favorite celebrities for the day — and sometimes celebrities take inspiration from fellow stars.
Kourtney Kardashian simply looked to sister Kim Kardashian for inspo in 2023. Kourtney, who was pregnant with her fourth child, posed as her younger sister, donning Kim’s 2013 Met Gala look. Kim was pregnant with daughter North when she wore the floral Givenchy creation.
For Halloween in 2018, Rita Ora fully transformed into Post Malone. She donned a wig, faux facial hair and fake versions of the “Better Now” artist’s signature face tattoos.
The “Your Song” singer’s take on Malone was so impressive, one news outlet mistakenly confused her for the Grammy nominee. “When I looked at that [tweet], I was like, ‘Someone’s getting fired,’” she said on The Tonight Show Starring Jimmy Fallon in May 2019. “That was so funny. Everyone kept tweeting me, and I was like, ‘Hey, am I performing at the Grammys? Oh, it’s not me.’”
Us Weekly rounded up the best photos of celebrities dressing up as fellow celebrities on Halloween over the years. Scroll down to see who became who!
Jessica Alba as Britney Spears
The actress donned a bejeweled nude bodysuit with a blonde wig while channeling Spears’ look from the “Toxic” music video for a Halloweekend party in 2023.
Kourtney Kardashian as Kim Kardashain
The pregnant reality star dressed up as sister Kim at the 2013 Met Gala in October 2023.
Rosalia as Bjork
The singer was Björk for Halloween 2023, donning the Icelandic performer’s iconic swan dress from the 2001 Oscars.
Machine Gun Kelly and Megan Fox as Tommy Lee and Pamela Anderson
The engaged couple dressed up as the former lovebirds while attending Casamigos Halloween Party in October 2022.
Kerry Washington as Lionel Richie
The Scandal alum recreated Richie’s 1982 album cover. She also shared a video of herself in October 2022 as the musician singing his hit song “You Are.”
Josh Duhamel and Audra Mari as J. Howard Marshall and Anna Nicole Smith
The newlyweds poked fun at their age difference by embodying Anna Nicole Smith and her husband at the 2022 Casamigos Halloween Party.
Jesy Nelson as Pamela Anderson
The former Little Mix singer channeled the sex symbol while celebrating Halloween 2022.
Lori Harvey as Beyonce
The model showed off the many looks of Beyoncé during Halloween 2022. Harvey recreated some of the Texas native’s iconic ensembles from her “Me Myself and I” and “Check on It” music videos.
Frankie Jonas as Joe Jonas
The youngest Jonas sibling trolled his brother Joe by dressing up as the Camp Rockstar during his brief romance with Taylor Swift. Frankie’s girlfriend portrayed the “Fearless” songstress as the couple stepped out in 2022.
Rachel Zegler as Julia Roberts
The West Side Story star embodied Roberts’ iconic Pretty Woman character, Vivian Ward, while preparing for Halloween in 2022.
Trevor Noah as The Weeknd
In 2021, the comedian dressed as the “Blinding Lights” crooner, calling himself “The Weekday.”
Rihanna as Gunna
The Fenty Beauty founder dressed as rapper Gunna for Halloween 2021.
Olivia Wilde as Dolly Parton
The Booksmart director went as the country legend while attending the first night of Harry Styles‘ 2021 Harryween concerts in New York City.
Kaitlyn Bristowe and Jason Tartick as Megan Fox and Machine Gun Kelly
In 2021, the former Bachelorette and her fiancé went as the Jennifer’s Body star and the rapper.
Anderson .Paak as Bruno Mars
The singer recreated the cover for his Silk Sonic bandmate’s 2016 album, 24K Magic, for Halloween 2021.
Travis Barker and Kourtney Kardashian as Sid Vicious and Nancy Spungen
The musician and the Poosh founder channeled their inner rocker vibes for the couples costume.
“Till death do us part,” the reality star captioned a pic via Instagram in October 2021, days after they got engaged.
Ciara and Russell Wilson as Janet Jackson and Busta Rhymes
For Halloween 2020, the married duo recreated Jackson and Rhymes’ looks from their 1999 music video “What’s It Gonna Be?!”
Jacob Elordi and Kaia Gerber as Elvis and Priscilla Presley
In 2020, the Euphoria actor dressed as the King of Rock ‘n Roll while the model went as Elvis’ former wife.
Margot Robbie as Geri Halliwell
The Harley Quinn: Birds of Prey actress went as Spice Girls member Geri Halliwell in 2020 by recreating the singer’s iconic 1990s Union Flag dress look. “Spice Up Your Life ?,” Robbie captioned her Instagram pic.
Ciara as Meghan Thee Stallion
The “Goodies” singer transformed into Meghan for Halloween in 2020 by reimagining the rapper’s iconic cover look from her “Girls in the Hood” single.
Emily Ratajkowski
While pregnant with her first child in 2020, the model channeled Demi Moore’s iconic nude pregnancy shoot that was shot by Annie Leibovitz for Vanity Fair in 1991. Moore was expecting her second child, Scout Willis, at the time with then-husband Bruce Willis.
Kendall Jenner as Pamela Anderson
The Keeping Up With the Kardashians star dressed up as Pamela Anderson for Halloween 2020. For this costume, Jenner specifically replicated the Baywatch alum’s look from her 1996 film Barb Wire.
Mindy Kaling as Reese Witherspoon and Kerry Washington
The Office alum played double duty in 2020 when she dressed up as Reese Witherspoon and Kerry Washington’s Little Fires Everywhere characters.
Kelly Ripa and Ryan Seacrest as Carole Baskin and Joe Exotic
During a pre-Halloween episode of Live With Kelly and Ryan in 2020, Ripa and Seacrest transformed into Tiger King stars Carole Baskin and Joe Exotic, respectively.
Ciara as Cardi B
The “Level Up” singer and her son, Future, dressed up as hip-hop power couple Cardi B and Offset for Halloween in 2020. Their efforts even caught the attention of the “WAP” rapper, who shared a video of the mother-son duo rapping along to her song “Drip.”
“I’m gagging! I love it! I’m so hype!” Cardi wrote via Instagram. “I’ve always been a huge fan of @ciara and became an even bigger fan after I met her! She is the most sweetest and the most nicest person in the world! A true peach! Staying sweet and humble was the prayer!”
Nina Dobrev as Billie Eilish
“All the good girls go to hell.” Vampire Diaries alum Nina Dobrev channeled her inner pop star as Billie Eilish at the annual Casamigos Halloween party in Beverly Hills, California, in October 2019.
Jessica Biel as ’NSync-era JT
Jessica Biel relived her husband’s glory days at an October 2019 bash! The actress trolled Justin Timberlake with a hilarious ‘NSync group costume at the Casamigos “Brought to You By Those Who Drink It” party. JT was also in attendance and dressed as a giant microphone.
Lisa Rinna as Jennifer Lopez
The Real Housewives of Beverly Hills star gave JLo a run for her money with a rendition of the singer’s iconic green Versace dress from the 2000 Grammy Awards. After seeing the pics, the “Hustlers” actress told Access Hollywood she thought Rinna “looked awesome!”
Kourtney Kardashian as Ariana Grande
The Keeping Up With The Kardashians star channeled pop singer Ariana Grande for Halloween 2018. “No tears left to cry,” she captioned a throwback photo of the costume in October 2019.
Chrissy Teigen and John Legend as Queen Elizabeth and Prince Philip
For Halloween in 2018, the longtime couple took inspiration from the British Royal family when they dressed up as Queen Elizabeth and Prince Philip.
Rita Ora as Post Malone
“Ima get Halloween started for you the right way… postttyyyyyy I LOVE YOU BRO @postmalone…ratatatatataata wassssss gooood!!” the “Your Song” singer captioned a photo of herself dressed up as the rapper on Instagram in October 2018.
Harry Styles as Elton John
The former One Direction member recreated the bedazzled Dodgers uniform that John wore during a performance at Dodger Stadium in 1975. The “Tiny Dancer” singer seemingly approved of the look, writing, “Now that’s what I call a Halloween costume,” on Instagram in October 2018.
Gabrielle Union as Gwen Stefani
The actress’ look for her birthday party in Miami, Florida, in October 2018 was inspired by No Doubt’s “Spiderwebs” 1996 music video.
Jenna Ortega and Asher Angel as Ariana Grande and Pete Davidson
The Disney darling and her boyfriend dressed up as the pop star and the comedian in October 2018, just weeks after Grande and Davidson called off their engagement.
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Lisa Rinna as Erika Jayne 2018
Rinna channeled her Real Housewives of Beverly Hills costar for Halloween 2018. “Lisa Rinna WON Halloween!!!” Jayne wrote on Instagram at the time.
Kim Kardashian and Jonathan Cheban as Sonny and Cher
The reality TV star and her bestie dressed as Sonny and Cher for a ‘70s themed Halloween bash in 2017.
Ariel Winer and Levi Madden as Pamela Anderson and Kid Rock
The duo paid homage to another one-time celebrity couple for Halloween 2018, wearing outfits inspired by the actress and the rocker’s appearance at the 2002 American Music Awards.
Martha Stewart as Marilyn Monroe
In 2016, the lifestyle guru went as the late icon Marilyn Monroe.
Kylie Jenner as Christina Aguilera
Jenner recreated Aguilera’s iconic look from her 2002 music video for “Dirrty” for Halloween 2016. “YAASSSSS”…..Killin it @kyliejenner,” the pop star wrote alongside a photo of the reality star on Instagram at the time. “Yes to dirrty 2016!! Get it girl!!!”
Taylor Lautner and Nina Dobrev as Ryan Lochte
The Twilight actor and Vampire Diaries alum both channeled the Olympian in October 2016.
Aziz Ansari as The Weeknd
For Halloween in 2015, the Parks and Recreation alum went as The Weeknd.
Miranda Kerr as Marilyn Monroe
The model looked nearly identical to the late star in October 2015.
Victoria Justice as Amy Winehouse
The Nickelodeon alum dressed up as the late singer for Halloween in 2015.
Paris Hilton as Miley Cyrus
The socialite paid tribute to Cyrus’ infamous performance with Robin Thicke at the 2013 Video Music Awards on Halloween that year.