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." 

Kim Kardashian, Jonathan Cheban, Halloween

Neilson Barnard/Getty Images for Casamigos Tequila

Sonny Bono, Cher

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.

Ariel Winter, Halloween 2017

Michael Wada

The Modern Family star celebrates Halloween week at The Queen Mary's Dark Harbor in Long Beach, California.

January Jones, Halloween 2017


"Rapunzel selfie for the win/lose," the actress shared on Instagram while dressed as Disney's Rapunzel.

Kendall Jenner, 2017 Halloween

GUMU, ROLO/Backgrid

The Keeping Up With the Kardashians star dresses up like a Powerpuff Girl in her custom Bryan Hearns design. 

John Legend, Chrissy Teigen, Halloween 2017


"Happy Halloween! #copacabana," the "All of Me" singer shared on Instagram while posing with Chrissy Teigen. 

Heidi Klum

Michael Stewart/Getty Images

Ready for Halloween? The Project Runway judge performs Michael Jackson's "Thriller" during her 18th Annual Halloween Party sponsored by SVEDKA Vodka at Magic Hour Rooftop Bar and Lounge at Moxy Times Square.

Pink, Halloween 2017


"Happy Halloween from the crazy people #piratelife," the singer shared with her family. 

Maci Bookout, Halloween 2017


"Happy Halloween from Woody, Jessie, Ken, Barbie, and BeastMode!" the Teen Mom O.G. star shared on Instagram before trick-or-treating. 

Jessica Simpson, Halloween 2017


Hot damn! The husband and wife make quite a splash as Willie Nelson and Waylon Jennings.

Jessica Biel, Justin Timberlake, Halloween 2017


"If you see us in these streets then have your candy ready! Trick-Or-Treat, little homies!" the pop star wrote on social media, signing the note "Woody, Jesse, and Buzz."

G-Eazy, Halsey

The cute couple enjoy a cuddle during her 2nd Annual Halloween Party presented by Freixenet Cava.

Fergie, Halloween 2017


The newly single pop star steps out for trick or treating with her little boy Axl

Jessica Alba, Cash Warren, Halloween 2017


The Alba family vants to suck your blood!

Ariel Winter, Levi Meaden, Halloween


The two dress up as Leeloo and Korben Dallas from The 5th Element.

Emma Robert, Evan Peters, Halloween 2017


No American Horror Story here! This couple makes for picture perfect witches.

Wiz Khalifa, Izabela Guedes, Halloween 2017


"Wiz' World," the rapper shared on Instagram before celebrating Halloween at TAO LA and Avenue. 

Sarah Michelle Gellar, Freddie Prinze Jr., Halloween 2017


"Happy Halloween everyone!" the actor captioned this photo. "Eat your heart out John Cryer! Next year ... Maxwell Houser makes an appearance."

Jessie James Decker, Halloween 2017


The pregnant country singer and E! reality star holds her very own Mickey Mouse close. 

Tom Brady, Gisele Bundchen, Halloween 2017


Millennials rejoice—the supermodel is the toast to the NFL star's avocado. 

Khloe Kardashian, Tristan Thompson, Halloween 2017


Mother of dragons! The E! reality star and her basketball playing beau go as their favorite characters from Game of Thrones

Carrie Underwood, Mike Fisher, Halloween 2017


"The only deer I am OK with @mfisher1212 'catching!'" the country singer captioned the couples shot. "@catchindeers #HelpMe #happyhalloween #veganwifeproblems"

Ryan Lochte, Kayla Rae Reid, Halloween 2017


It's a whole new world for this Olympic gold medalist and wife who wear costumes from Yandy.com

Kendra Wilkinson-Baskett, Hank Baskett, Halloween 2017


Trick or treat says this famous family!

Natalie Dormer, Halloween


Yo ho, yo ho, it's a pirate's life for this actress!

Today, Halloween

Nate Congleton/NBC News’ “TODAY”

Dolly Parton and Kenny Rogers, is that you?!

Amber Rose, Halloween 2017


"Chucky ❤️'s Tiffany FOREVER!!!!" the social media sensation shared on Instagram. 

Tony Goldwyn, Kerry Washington, Bellamy Young, Halloween 2017


The cast of Scandal goes all out for Halloween.

Colton Haynes, Jeff Leatham

Rupert Thorpe

Cheers! An unrecognizable Colton enjoys some Freixenet Cava while partying with his hubby at Frexienet's 2nd Annual Black Magic Affair.

Rob Kardashian, Dream Kardashian, Blac Chyna, Halloween

Instagram, E!

Rob Kardashian and Blac Chyna's almost 1-year-old tot is a picture perfect Raggedy Ann!

Nicole Scherzinger, Halloween 2017


Walk like an Egyptian!

Vanessa Hudgens, Halloween 2017


Skeleton sisters! "Nothing better than Halloween decorations, a chai latte, skeleton onesie and mi sister," she captioned this image while wearing PrettyLittleThing skeleton onesies.

Kelly Ripa, Ryan Seacrest, Halloween

David M. Russell, Disney/ABC Home Entertainment and TV Distribution

It's a Freaky Friday moment courtesy of the talk show hosts!

Tamra Judge, Halloween 2017


The Real Housewives of Orange County star works up a sweat at her CUT Fitness studio.

Today, Halloween

Nate Congleton/NBC News’ “TODAY”

The country music superstar surprised the ladies of Today, who rocked coordinating ensembles à la Miley Cyrus and Shelton.

Good Morning America, Halloween, 2017

ABC/Paula Lobo

The Good Morning America co-host went as baby Groot from Guardians of the Galaxy

Alessandra Ambrosio, Halloween 2017


Marvel's Deadpool and a skeleton walk into a Halloween party...

Halle Berry, Halloween 2017


The actress dubbed her look, "When Spider Witch becomes Spider B*tch at midnight."

Paris Hilton, Halloween 2017


The socialite is joined by two of her furry friends for a spooky photo opp.

Neil Patrick Harris, David Burtka, Halloween


"Hurry, hurry! Step right up and behold the Burtka-Harris Halloween Carnival of Curiosities! #happyhalloween @dbelicious," the actor shared in his family photo. 

Holly Madison, Halloween 2017


Stranger Things have happened than this former Playboy bunny dressing up as Eleven from the Netflix series.

Hilary Duff, Halloween 2017


"A lego and a bunny go to a party," the Younger star shared on Instagram while posing with her son Luca. 

Good Morning America, Halloween, 2017

ABC/Paula Lobo

Super heroes and heroines from the Marvel Universe stole the show at GMA.

Matthew Morrison, Halloween

Vivien Best

The Glee star give a thumbs up at his 8th Annual Halloween Party presented by PAC SUN and Podwall Entertainment at The h.wood Group's Poppy.

Wiz Khalifa, 2017 Halloween

Banfy / TAO Group

The rapper, dressed as Wiz' World, celebrates Halloween at TAO LA and Avenue LA.

Ariel Winter, Levi Meaden, Halloween 2017

Nate Weber / Universal Studios Hollywood

Traveling in pairs is always better than going solo while at Universal Studios Hollywood's "Halloween Horror Nights."

Naomi Campbell, Halloween

Kevin Tachman/amfAR2017/WireImage

The supermodel stops the show at with her stunning costume at the 2017 Naked Heart Foundation x amfAR: Fabulous Fund Fair in New York City.

Kristen Doute, Brian Carter, Halloween 2017

John Sciulli/Getty Images for Chivas Regal

The Vanderpump Rules couple attends Diego Boneta's Halloween Party with Chivas Regal in West Hollywood. 

Karlie Kloss, 2017 amfAR Fabulous Fund Fair

Nicholas Hunt/Getty Images

The model goes Marilyn Monroe for the 2017 Naked Heart Foundation x amfAR: Fabulous Fund Fair in New York City.

JWoww, Halloween 2017


"Goals," the Jersey Shore star wrote on Instagram while dressing up one day early with her family. 


See More From Stars Celebrate Halloween 2017

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 TrachtenbergCourtney LoveMolly Sims and husband Scott StuberJon HammDavid SpadeRachel ZoeRachel RoySeth MacFarlaneSacha Baron Cohen (a yellow smiley face emoji) and wife Isla Fisher (a unicorn), Alessandra AmbrosioDerek Hough (teddy bear) and girlfriend Hayley Erbert (Wonder Woman), Russell Simmonsand Adrien Brody—who dressed up as a panda!

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