Kim Kardashian and Jonathan Cheban Are Sonny and Cher for Halloween

When Kim Kardashian needed a friend to help her with her Halloween costume, Jonathan Cheban was like, "I got you babe!"

He and the Keeping Up With the Kardashians star dressed up as the late Sonny Bono and pop superstar Cher for the 2017 Casamigos Halloween Party. Kim wore a yellow, long sleeve, bohemian-style crop top and flared pants with sparkling embellishments. Jonathan wore a wig and fake mustache and plum checkered tux. She also sported a long, dark brown wig—similar to her own natural hair—over her platinum blond locks.
The real Cher was very impressed with Kim and Jonathan's tribute.
"@KimKardashian Woke To See You Are Me 4...You Look BEAUTIFUL Little Armenian Sister," she tweeted. "Dream Of India Is Perfect 4U & @BobMackie at his best."
Kim seemed relaxed and in a great mood at the party, E! News has learned. She chatted with model Kelly Sawyer, who was dressed as a cheerleader, as well as other pals. After a few minutes outside, Kim and Cheban linked arms and walked inside the party, did a small lap and left, E! News has learned.
They later had a blast filming Snapchat videos of themselves lip-synching the former couple's 1965 hit "I Got You Babe" and Cher's 1998 dance song "Believe." 

Neilson Barnard/Getty Images for Casamigos Tequila

Ron Galella/WireImage

The Casamigos Halloween party is an annual bash thrown by the company owned by George Clooney and Rande Gerber. The latter attended Friday's event, which had a '70s disco theme, with wife Cindy CrawfordGeorge's wife Amal Clooney and kids Kaia Gerber and Presley Gerber, who brought friends with them. Amal and the Gerber family wore '70s-style outfits. Amal sported a strapless, sparkling blue jumpsuit, large hoop earrings and round sunglasses and a large, afro-style curly wig.
Amal hung out with Cindy in a booth, had fun dancing to the disco music playlist and drank a Casamigos cocktail.
See photos of famous guests at the party as well as pics of other celebs celebrating Halloween 2017.

Neilson Barnard/Getty Images for Casamigos Tequila

Kim Kardashian and Jonathan Cheban

The two dress up as Cher and Sonny Bono for the 2017 Casamigos Halloween Party.

GICA / BACKGRID

Adam Levine

The singer said he raided wife Behati Prinsloo's closet for his Halloween costume.

Michael Kovac/Getty Images for Casamigos Tequila

Amal Clooney

George Clooney's wife gets into the '70s spirit at the 2017 Casamigos Halloween Party.

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Michael Kovac/Getty Images for Casamigos Tequila

Amal Clooney, Rande Gerber and Cindy Crawford

The couple and George Clooney's lawyer wife have fun at Rande and George's 2017 Casamigos Halloween Party.

Michael Kovac/Getty Images for Casamigos Tequila

Kaia Gerber and Presley Gerber

Rande Gerber and Cindy Crawford's kids embrace the '70s.

Michael Kovac/Getty Images for Casamigos Tequila

Adrien Brody

He's so soft and cuddly!

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Michael Kovac/Getty Images for Casamigos Tequila

Michelle Trachtenberg

It's the Buffy the Vampire Slayer and Gossip Girl alum like you've never seen her before!

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Joe Keery

Fancy a game of Quiddich? The Stranger Things star is a dead ringer for Harry Potter circa Goblet of Fire!

Kim Zolciak-Biermann / Instagram

Kim Zolciak-Biermann and Kroy Biermann

Kim dressed up as Playboy Playmate of 2005 Tiffany Fallon while her husband Kroy Biermann was the recently deceased Hugh Hefner at a Real Housewives of Atlanta Halloween party.

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Ariel Winter

The Modern Family star appears as a skeleton.

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NeNe Leakes and Gregg Leakes

At a Real Housewives of Atlanta Halloween / finale party, the two poke fun at a controversy involving NeNe and Kim Zolciak-Biermann and her daughter Brielle Biermann, who NeNe had called "racist" after the latter shared a Snapchat video that shows the girl appearing disgusted by a large black insect crawling in a bathroom in the Leakes' home. NeNe shared a photo of the two on Instagram, writing, "Roach Pest Control in full effect #RHOA."

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Real Housewives of Atlanta

The cast really went all out for Halloween!

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Kim Zolciak-Biermann / Instagram

Kim Zolciak-Biermann

Before attending the finale of Real Housewives of Atlanta, the Bravo star poses with Kroy Biermann in their Playboy-inspired attire.

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Angela Simmons

"Early Halloween costume party fun," the reality star shared on Instagram.

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Kendra Wilkinson-Baskett

"Happy #NationalPumpkinDay," the Kendra On Top star shared on social media with photos of her children.

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Mike Danenberg / Universal Studios Hollywood

Demi Lovato

In between celebrating the success of her latest single "Sorry Not Sorry," the singer hits up Universal Studio's Halloween Horror Nights.

Paul Archuleta/FilmMagic

Corinne Olympios and DeMario Jackson

The two get playful at the Maxim Halloween party.

Rodin Eckenroth/Getty Images for MAXIM

Jason Derulo

The singer performs as Game of Thrones' Night King.

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Mike Danenberg / Universal Studios Hollywood

Ice-T & Coco

"We highly recommend it. It was so much fun," Coco wrote on Instagram after visiting Universal Studio's Halloween Horror Nights.

Rodin Eckenroth/Getty Images for MAXIM

Tom Sandoval

The Vanderpump Rules fan-favorite arrives at the 2017 MAXIM Halloween Party at LA Center Studios with an ensemble not exactly fit for SUR.

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Tara Reid

The actress showcases a shredded look.

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Mike Danenberg / Universal Studios Hollywood

Jodie Sweetin

The Fuller House star alongside co-stars Juan Pablo Di Pace and John Brotherton attend Universal Studio's Halloween Horror Nights.

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Chase McNary, Robby Hayes and DeMario Jackson

Bachlor Nation represent!

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Maksim Chmerkovskiy and Peta Murgatroyd

The Dancing With the Stars married couple strike a pose at the MAXIM Halloween Party.

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Rodin Eckenroth/Getty Images for MAXIM

Scheana Marie

The Vanderpump Rules star is a sexy skeleton

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Jerry Seinfeld, Jessica Seinfeld & Gwyneth Paltrow

"@jessseinfeld @jerryseinfeld and I (in no costume, LAME) at the 2nd annual @goodplusfdn Halloween bash!" Gwyneth wrote on Instagram. "Please see next slide for best baby costume ever in the history of the world."

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Channing Tatum

The proud papa slips on a unicorn costume for his daughter's preschool's Halloween carnival.

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Jenna Dewan Tatum

The actress goes as a fairy for daughter Everly's Halloween costume carnival at her preschool.

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Emma Kenney

The star of Shameless and the reboot of Roseanne is all dolled up.

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Kelly Ripa & Ryan Seacrest

Before Live With Kelly & Ryan airs their Halloween special, the co-hosts teased their Game of Thrones costumes.

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Jaime King

"When the fam takes Halloween VERY seriously @powerrangers @walmart #powerrangers," the actress shared on Instagram while wearing matching Power Rangers movie costumes.

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Chrissy Teigen

"Hay place. a place for hay," the proud mom wrote on Instagram after visiting Mr. Bones Pumpkin Patch with John Legend and baby Luna.

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Catherine Lowe

"FRIDAY IS LIT," The Bachelor star joked on Instagram while enjoying a Halloween party with her family.

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Jerod Harris

Peyton List

Roller coasters just became a bit more scary for the Jessie star who traveled to Knott's Scary Farm in Buena Park, Calif.

Courtesy of Anderson Group PR

Jillian Rose Reed

The Awkward star celebrates the spooky season with a visit to the Los Angeles Haunted Hayride at Griffith Park.

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Thomas Rhett

"To watching Hocus Pocus 4 million times before Halloween and to carving Willa Gray's first pumpkin," the "Unforgettable" country singer shared on Instagram.

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Courtesy of "The Ranch"

Ashton Kutcher & Danny Masterson

Joined by co-star Elisha Cuthbert, the Hollywood stars celebrate Halloween early on the set of their Netflix show The Ranch that returns December 15.

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Paris Hilton

That's hot scary! The DJ and model can't help but smile in the face of terror at Universal Studios Hollywood's "Halloween Horror Nights."

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Jade Tolbert

"Pumpkin patch parent fail. When you both are so excited to start family traditions, but your baby only wants to nap in your arms," the Bachelor in Paradise star joked online. "At least we still got apple cider donuts. #weweretherefor5minutes #newbies."

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Wiz Khalifa

"Our favorite time of year," the rapper shared on Instagram while visiting the pumpkin patch with his son.

Mike Danenberg / Universal Studios Hollywood

Kendrick Lamar

The Grammy winning rapper enjoys a spooky night out at Universal Studios Hollywood's "Halloween Horror Nights."

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Amber Portwood

"So cute!" the Teen Mom O.G. star shared on Instagram. "Leah with her little cousin today at the pumpkin patch."

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Nate Weber / Universal Studios Hollywood

Pete Wentz, Breckin Meyer & Seth Green

It's a guys night out at Universal Studios Hollywood's "Halloween Horror Nights" as the Fall Out Boy singer joins his acting friends.

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Gerard Piqué

"Mask shopping! @shakira," the soccer star shared online while teasing his future costume.

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Lauren Conrad

"This little lamb had his first trip to the pumpkin patch today," the fashion designer shared on Instagram.

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Dream Kardashian

"Dream's first trip to the zoo!" Rob Kardashian wrote on Twitter as his daughter enjoyed the Halloween attractions.

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Jessica Simpson

"I ain't afraid of no ghost!!" the fashion designer shared on Instagram with a photo of her two kids. "#October #Halloween #Ghostbusters #mykidsareeverything."

Great Wolf Lodge

Jamie Lynn Sigler

While celebrating the Halloween season, the actress heads to the Great Wolf Lodge in Garden Grove, Calif., during their month-long Howl-O-Ween celebration.

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Shannen Doherty was spotted with husband Kurt Iswarienko. The actress, who recently battled breast cancer, looked fab in a short black bob wig, fishnet tights, short denim shorts and a black top and was laughing and smiling. 

Other celebrity guests included Buffy the Vampire Slayer and Gossip Girl alum Michelle Trachtenberg, Courtney Love, Molly Sims and husband Scott Stuber, Jon Hamm, David Spade, Rachel Zoe, Rachel Roy, Seth MacFarlane, Sacha Baron Cohen (a yellow smiley face emoji) and wife Isla Fisher (a unicorn), Alessandra Ambrosio, Derek Hough (teddy bear) and girlfriend Hayley Erbert (Wonder Woman), Russell Simmonsand Adrien Brody—who dressed up as a panda!