How Khloe Kardashian's sisters first reacted to Tristan Thompson's cheating scandal -- and who told Khloe

Khloe Kardashian’s sisters are about to learn about Tristan Thompson’s cheating scandal. 

In an E! News sneak peek of Sunday’s all-new Keeping Up With the Kardashians, Khloe's sisters first find out online that Tristan was allegedly spotted making out with another girl just before the couple’s now 6-month-old daughter, True, was born. 

In the clip, Kendall Jenner, Scott Disick, Kim Kardashian West, Kourtney Kardashian and Kylie Jenner all react to the report that the NBA pro was unfaithful to Khloe. 

Kendall is in the car with Scott when she gasps aloud at a text she’s receives from Kim. “Stop! Bro, that’s pretty serious, isn’t it,” Scott exclaims, before questioning if it’s “for sure, for sure.”

“I don’t know, that’s what I’m trying to find out,” Kendall responds.

Later, Kendall goes on to read out loud some of the source reporting about the incident. “The woman who filmed the clip said, ‘I was there and he was on the table right next to us with a group of friends. Everybody watched them make out several times,’” she reads.

“I’m, like, in shock right now. I don’t even know what to say,” Kendall says. “What a f**cking idiot. It’s a sick joke… Oh my God, I’m going to cry for her.”

21 PHOTOS
Khloe Kardashian and Tristan Thompson
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Khloe Kardashian and Tristan Thompson
We are ready whenever you are little mama 🦋
FBF to one of my favorite days with all of my favorite people... my surprise party 🎉 man, everyone was sooooo good at keeping that secret! Hrush, Jen and Tristan were so calm, cool and collected during glam 👀 I need to watch you sneaks lol That was such an epic night!
❥ Mom and Dad ❥
LOS ANGELES, CA - FEBRUARY 17: Tristan Thompson and Khloe Kardashian attend the Klutch Sports Group 'More Than A Game' Dinner Presented by Remy Martin at Beauty & Essex on February 17, 2018 in Los Angeles, California. (Photo by Jerritt Clark/Getty Images for Klutch Sports Group)
Mommy and Daddy 📸 @sashasamsonova
LOS ANGELES, CA - MARCH 10: Tristan Thompson and Khloe Kardashian pose for a photo as Remy Martin celebrates Tristan Thompson's Birthday at Beauty & Essex on March 10, 2018 in Los Angeles, California. (Photo by Jerritt Clark/Getty Images for Remy Martin )
✨ To the happiest of birthdays my love! How special is this thing called life that we share together?! I am so blessed to be creating beautiful monumental memories with such a wonderful man! I hope this year brings you all that you dream of! You will forever be my always! I love you baby! ✨
💗
“When a woman is loved correctly, she becomes ten times the woman she was before” Thank you my love ❤️
✨ Day 1 of 2018 ✨
❥The day I met you, my life changed. Thank you my love!❥
👑Game Of Thrones 👑 thank you for everything @styledbyhrush @andrewfitzsimons @bryanhearns @missjilljacobs !! Happy Halloween 👻 🎃🦇
❤️ My Love ❤️
My love 💙
My birthday was incredible! Dream like almost! It's actually hard to put into words how special I feel and it's mainly because of this man right here! Thank you baby for treating me like a Queen every single day! Thank you to all of my friends and family for helping surprise me and for being the best anyone could ask for!! (Tap for glam details)
❤️
💕 US 💕
Sweet Sunday 💋
The Fab Four
To the happiest of birthdays my love! To the first of many more together! May God continue to bless you in all of your days! And may we forever look at one another like this 💋
❥ իմ սեր ❥ Im ser ❥ All my Love ❥
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Meanwhile, Kim was on set filming for the show when she learned the news. In the clip, she stares intently at her phone and asks everyone to hold on, before saying, “Yikes.”

"There’s video of Tristan making out with a girl last night,” Kim reveals to the cameras. “Khloe’s going to die.”

Kourtney appears to be walking through her house as she digests the information. “I mean, I can’t even imagine being in Khloe’s shoes,” she says in the confessional. “Just how reckless it all seems. This is really shocking and obviously heartbreaking. The whole thing makes me disgusted.”

The sisters quickly learn that their youngest member, Kylie, sent the article to Khloe.

“Like do I call Khloe?” Kim questions to herself. “... She’s literally going to go in labor over this.”

“Oh no,” Kendall tells Scott. “She def knows, but she’s not responding to the texts.”

For Kylie, it was important to tell Khloe herself, so she wouldn’t find out online.

“No one had the courage to tell Khloe because we knew she was days away from giving birth, we didn’t want to stress her out, but we knew it was the right thing to do,” Kylie, who was getting her makeup done when she learned the news, says in the confessional. “So, I’m the one who told Khloe. I didn’t want to hurt her feelings, but I felt like she should hear from one of us versus on the internet.”

The new clip comes a few days after a source told ET that Khloe flew back to Cleveland, Ohio, with Tristan -- where he plays for the Cleveland Cavaliers -- after initially putting her move on hold.   

"Khloe and Tristan are still working on things, but know whatever they decide to do moving forward, it will be whatever is best for their daughter, True," the source said. "Khloe isn’t certain how long she will be in Cleveland and may fly back for her mom, Kris [Jenner's], birthday next week, but isn’t sure. A lot is dependent on how things go with her and Tristan.”

While in Cleveland, Khloe sat courtside at Tristan’s game.  

The move comes as a bit of a surprise. Last month, a source told ET that Khloe was unsure if she was going to return to Cleveland, largely in part because it’s “been hard” for her to relive the scandal while watching this season of KUWTK

"As much as she's worked on moving past the heartbreak, the reminder brings up some of those emotions again," the source said. "Khloe will most likely head back to Cleveland, but as of now, there isn't an official date."

Despite the uncertainty currently in their relationship, Khloe and Tristan did spend Halloween together with True, who they dressed as a flamingo.  

Keeping Up With the Kardashian airs Sundays at 9 p.m. on E!

68 PHOTOS
Kim Kardashian out and about in 2018
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Kim Kardashian out and about in 2018
SANTA MONICA, CA - NOVEMBER 11: 2018 E! PEOPLE'S CHOICE AWARDS -- Pictured: (l-r) Kim Kardashian backstage during the 2018 E! People's Choice Awards held at the Barker Hangar on November 11, 2018 -- NUP_185073 -- (Photo by Todd Williamson/E! Entertainment/NBCU Photo Bank via Getty Images)
NEW YORK, NY - DECEMBER 03: Kim Kardashian West attends opening night of 'The Cher Show' at Neil Simon Theatre on December 3, 2018 in New York City. (Photo by Taylor Hill/FilmMagic)
NEW YORK, NEW YORK - DECEMBER 03: Kim Kardashian West attends the opening night of the new musical 'The Cher Show' on Broadway at Neil Simon Theatre on December 03, 2018 in New York City. (Photo by Dominik Bindl/Getty Images)
NEW YORK, NEW YORK - DECEMBER 02: Kim Kardashian (L) and Kanye West attend the Versace Pre-Fall 2019 Runway Show at the American Stock Exchange in the Financial District on December 02, 2018 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NEW YORK - DECEMBER 02: Kanye West and Kim Kardashian West attend the the Versace fall 2019 fashion show at the American Stock Exchange Building in lower Manhattan on December 02, 2018 in New York City. (Photo by Roy Rochlin/Getty Images)
SANTA MONICA, CA - NOVEMBER 11: 2018 E! PEOPLE'S CHOICE AWARDS -- Pictured: (l-r) Chrissy Teigen and Kim Kardashian backstage during the 2018 E! People's Choice Awards held at the Barker Hangar on November 11, 2018 -- NUP_185073 -- (Photo by Todd Williamson/E! Entertainment/NBCU Photo Bank via Getty Images)
LOS ANGELES, CA - NOVEMBER 03: Kim Kardashian attends the 2018 LACMA Art + Film Gala at LACMA on November 03, 2018 in Los Angeles, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
LOS ANGELES, CA - NOVEMBER 03: Kourtney Kardashian and Kim Kardashian attend the 2018 LACMA Art + Film Gala at LACMA on November 03, 2018 in Los Angeles, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
NEW YORK, NY - OCTOBER 09: Kim Kardashian attends the 2018 Tiffany & Co. Blue Book Gala on October 9, 2018 in New York City. (Photo by Steven Ferdman/WireImage,)
NEW YORK, NY - OCTOBER 09: Kim Kardashian West attends Tiffany & Co. Celebrates 2018 Tiffany Blue Book Collection, THE FOUR SEASONS OF TIFFANY at Studio 525 on October 9, 2018 in New York City. (Photo by Nicholas Hunt/Getty Images for Tiffany & Co.)
NEW YORK, NY - OCTOBER 09: Kim Kardashian is seen in a backless white dress on October 9, 2018 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - SEPTEMBER 30: Kim Kardashian seen out and about in Manhattan on September 30, 2018 in New York City. (Photo by Robert Kamau/GC Images)
NEW YORK, NY - SEPTEMBER 29: (L-R) North West, Kim Kardashian and Penelope Disick are seen in SoHo on September 29, 2018 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - SEPTEMBER 29: Kim Kardashian (R) and North West seen in Manhattan on September 29, 2018 in New York City. (Photo by Robert Kamau/GC Images)
NEW YORK, NY - SEPTEMBER 28: Kim Kardashian seen out and about in Manhattan on September 28, 2018 in New York City. (Photo by Robert Kamau/GC Images)
LOS ANGELES, CA - SEPTEMBER 27: Kim Kardashian is seen wearing a money dress and matching boots on September 27, 2018 in Los Angeles, California. (Photo by PG/Bauer-Griffin/GC Images)
LOS ANGELES, CA - SEPTEMBER 27: Kim Kardashian is seen on September 27, 2018 in Los Angeles, California. (Photo by wowcelebritytv/Bauer-Griffin/GC Images)
BEVERLY HILLS, CA - AUGUST 21: Kim Kardashian West attends Christie's x What Goes Around Comes Around 25th Anniversary Auction Preview at What Goes Around Comes Around on August 21, 2018 in Beverly Hills, California. (Photo by Michael Kovac/Getty Images for What Goes Around Comes Around)
BEVERLY HILLS, CA - AUGUST 21: Kim Kardashian attends What Goes Around Comes Around 25th Anniversary Auction Beverly Hills Preview, presented by Christie's, at What Goes Around Comes Around on August 21, 2018 in Beverly Hills, California. (Photo by Jean Baptiste Lacroix/WireImage)
LOS ANGELES, CA - AUGUST 09: Kim Kardashian is seen on August 9, 2018 in Los Angeles, CA. (Photo by Hollywood To You/Star Max/GC Images)
JIMMY KIMMEL LIVE! - 'Jimmy Kimmel Live!' airs every weeknight at 11:35 p.m. EDT and features a diverse lineup of guests that include celebrities, athletes, musical acts, comedians and human interest subjects, along with comedy bits and a house band. The guests for Monday, July 30 included Kim Kardashian West ('Keeping Up with the Kardashians'), Hayley Atwell ('Christopher Robin'), and musical guest Train. (Randy Holmes via Getty Images) KIM KARDASHIAN WEST
INGLEWOOD, CA - JULY 29: Kim Kardashian West attends the first annual 'If Only' Texas hold'em charity poker tournament benefiting City of Hope at The Forum on July 29, 2018 in Inglewood, California. (Photo by Rich Fury/Getty Images)
INGLEWOOD, CA - JULY 29: Kris Jenner (L) and Kim Kardashian West attend the first annual 'If Only' Texas hold'em charity poker tournament benefiting City of Hope at The Forum on July 29, 2018 in Inglewood, California. (Photo by Rich Fury/Getty Images)
LOS ANGELES, CA - JULY 15: Kim Kardashian West attends the Beautycon Festival LA 2018 at the Los Angeles Convention Center on July 15, 2018 in Los Angeles, California. (Photo by David Livingston/Getty Images)
LOS ANGELES, CA - JULY 06: Kim Kardashian is seen leaving Nobu on July 06, 2018 in Los Angeles, California. (Photo by PG/Bauer-Griffin/GC Images)
LOS ANGELES, CA - JUNE 30: Kim Kardashian West attends KKW Beauty Fan Event at KKW Beauty on June 30, 2018 in Los Angeles, California. (Photo by Stefanie Keenan/Getty Images for ABA)
LOS ANGELES, CA - JUNE 30: Kim Kardashian West (L) and Kris Jenner attend KKW Beauty Fan Event at KKW Beauty on June 30, 2018 in Los Angeles, California. (Photo by Stefanie Keenan/Getty Images for ABA)
UNIVERSAL CITY, CA - JUNE 21: Kim Kardashian , Kanye West and La La Anthony attend Teyana Taylor Album release Party at Universal Studios Hollywood on June 21, 2018 in Universal City, California. (Photo by Prince Williams/Getty Images)
PARIS, FRANCE - JUNE 21: Kim Kardashian attends the Louis Vuitton Menswear Spring/Summer 2019 show as part of Paris Fashion Week on June 21, 2018 in Paris, France. (Photo by Bertrand Rindoff Petroff/Getty Images)
PARIS, FRANCE - JUNE 21: Kanye West and Kim Kardashian attend the Louis Vuitton Menswear Spring/Summer 2019 show as part of Paris Fashion Week on June 21, 2018 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)
LOS ANGELES, CA - MARCH 06: Kim Kardashian West speaks onstage at MDNA SKIN hosts Madonna and Kim Kardashian West for a beauty conversation at YouTube Space LA on March 6, 2018 in Los Angeles, California. (Photo by Kevin Mazur/Getty Images for Madonna's MDNA SKIN)
LOS ANGELES, CA - MARCH 06: Kim Kardashian west and Madonna backstage at MDNA SKIN hosts Madonna and Kim Kardashian West for a beauty conversation at YouTube Space LA on March 6, 2018 in Los Angeles, California. (Photo by Kevin Mazur/Getty Images for Madonna's MDNA SKIN)
CENTURY CITY, CA - JUNE 18: Kim Kardashian West attends the BoF West Summit at Westfield Century City on June 18, 2018 in Century City, California. (Photo by Christopher Polk/Getty Images for The Business of Fashion)
CENTURY CITY, CA - JUNE 18: Kris Jenner (L) and Kim Kardashian West attend the BoF West Summit at Westfield Century City on June 18, 2018 in Century City, California. (Photo by Christopher Polk/Getty Images for The Business of Fashion)
SANTA MONICA, CA - JUNE 16: TV personality Kim Kardashian, winner of the Best Reality Series/Franchise award for 'Keeping Up with the Kardashians', walks off stage during the 2018 MTV Movie And TV Awards at Barker Hangar on June 16, 2018 in Santa Monica, California. (Photo by Chris Polk/VMN18/Getty Images for MTV)
SANTA MONICA, CA - JUNE 16: TV personalities Kim Kardashian (L) and Kris Jenner attend the 2018 MTV Movie And TV Awards at Barker Hangar on June 16, 2018 in Santa Monica, California. (Photo by Jon Kopaloff/FilmMagic)
SANTA MONICA, CA - JUNE 16: KIm Kardashian arrives at the 2018 MTV Movie And TV Awards at Barker Hangar on June 16, 2018 in Santa Monica, California. (Photo by Steve Granitz/WireImage)
NEW YORK, NY - JUNE 15: Kanye West, Kim Kardashian and daughter North West seen out and about in Manhattan on June 15, 2018 in New York City. (Photo by Robert Kamau/GC Images)
NEW YORK, NY - JUNE 15: Kim Kardashian and Kanye West seen out and about in Manhattan on June 15, 2018 in New York City. (Photo by Robert Kamau/GC Images)
NEW YORK, NY - JUNE 14: (L-R) Kim Kardashian West, La La Anthony, and Jonathan Cheban attend the Nas 'Nasir' Album Listening Session on June 14, 2018 in New York City. (Photo by Johnny Nunez/WireImage)
NEW YORK, NY - JUNE 14: North West and Kim Kardashian seen on the streets of Manhattan on June 14, 2018 in New York City. (Photo by James Devaney/GC Images)
TODAY -- Pictured: Kim Kardashian West and Alice Johnson on Wednesday June 13, 2018 -- (Photo by: Nathan Congleton/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - JUNE 04: Kim Kardashian West attends the 2018 CFDA Fashion Awards at Brooklyn Museum on June 4, 2018 in New York City. (Photo by Dimitrios Kambouris/Getty Images)
NEW YORK, NY - JUNE 04: Kim Kardashian West attends the 2018 CFDA Fashion Awards at Brooklyn Museum on June 4, 2018 in New York City. (Photo by Kevin Mazur/WireImage)
TV personality Kim Kardashian is seen entering the grounds of the White House on May 30, 2018 in Washington, DC. (Photo by Mandel Ngan / AFP) (Photo credit should read MANDEL NGAN/AFP/Getty Images)
NEW YORK, NY - MAY 09: Kim Kardashian is seen walking in Soho on May 9, 2018 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - MAY 08: Kim Kardashian is seen in Chinatown on May 8, 2018 in New York City. (Photo by TheStewartofNY/GC Images)
NEW YORK, NY - MAY 08: (L-R) Talent Manager, Jenner Communications, Kris Jenner, Model Kendall Jenner, Founder, Kylie Cosmetics Kylie Jenner, and Founder and CEO, KKW Kim Kardashian attends an intimate dinner hosted by The Business of Fashion to celebrate its latest special print edition 'The Age of Influence' at Peachy's/Chinese Tuxedo on May 8, 2018 in New York City. (Photo by Dimitrios Kambouris/Getty Images for The Business of Fashion)
NEW YORK, NY - MAY 09: Kim Kardashian is seen walking in Soho on May 9, 2018 in New York City. (Photo by Raymond Hall/GC Images)
NEW YORK, NY - MAY 07: Kim Kardashian West attends the Heavenly Bodies: Fashion & The Catholic Imagination Costume Institute Gala at The Metropolitan Museum of Art on May 7, 2018 in New York City. (Photo by Kevin Tachman/Getty Images for Vogue)
NEW YORK, NY - MAY 07: Kim Kardashian attends the Heavenly Bodies: Fashion & The Catholic Imagination Costume Institute Gala at The Metropolitan Museum of Art on May 7, 2018 in New York City. (Photo by Jason Kempin/Getty Images)
NEW YORK, NY - MAY 07: Kim Kardashian West is seen arriving to the Heavenly Bodies: Fashion & The Catholic Imagination Costume Institute Gala on May 7, 2018 in New York City. (Photo by Gilbert Carrasquillo/GC Images)
NEW YORK, NY - MAY 07: TV Personality Kim Kardashian attends as The Mark Hotel celebrates the 2018 Met Gala at The Mark Hotel on May 7, 2018 in New York City. (Photo by Andrew Toth/Getty Images for The Mark Hotel)
BEVERLY HILLS, CA - MARCH 31: Kim Kardashian West attends KKWxMario Dinner at Jean-Georges Beverly Hills on March 31, 2018 in Beverly Hills, California. (Photo by Stefanie Keenan/WireImage)
WASHINGTON DC, UNITED STATES - 2018/03/24: Kim Kardashian and Husband Kanye West along with Daughter North West, show up to support March For Our Lives. Tens of thousands of Americans took to the street on Washington DC during the 'March for our Lives' demonstration against gun violence in schools in the United States. (Photo by Emilee McGovern/SOPA Images/LightRocket via Getty Images)
WASHINGTON, DC - MARCH 24: Kanye West and Kim Kardashian West attend March For Our Lives on March 24, 2018 in Washington, DC. (Photo by Paul Morigi/Getty Images for March For Our Lives)
WEST HOLLYWOOD, CA - MARCH 13: Kim Kardashian West attends Lorraine Schwartz launches The Eye Bangle a new addition to her signature Against Evil Eye Collection at Delilah on March 13, 2018 in West Hollywood, California. (Photo by Stefanie Keenan/Getty Images for Lorraine Schwartz )
WEST HOLLYWOOD, CA - MARCH 13: Kim Kardashian West attends Lorraine Schwartz launches The Eye Bangle a new addition to her signature Against Evil Eye Collection at Delilah on March 13, 2018 in West Hollywood, California. (Photo by Stefanie Keenan/Getty Images for Lorraine Schwartz )
CHATSWORTH, CA - MARCH 09: Kim Kardashian watches courtside as Sierra Canyon plays Foothills Christian for the CIF Open Division Playoffs at Sierra Canyon High School on March 9, 2018 in Chatsworth, California. (Photo by Cassy Athena/Getty Images)
HOLLYWOOD, CA - MARCH 05: Kim Kardashian attends the release of Marina Acton's new single 'Fantasize' at Boulevard3 on March 5, 2018 in Hollywood, California. (Photo by Jerritt Clark/Getty Images)
HOLLYWOOD, CA - MARCH 05: Marina Acton and Kim Kardashian take a selfie at the release of Marina Acton's new single 'Fantasize' at Boulevard3 on March 5, 2018 in Hollywood, California. (Photo by Jerritt Clark/Getty Images)
TOKYO, JAPAN - MARCH 02: Kim Kardashian, Kourtney Kardashian and Khloe Kardashian are seen upon arrival at Tokyo Station on March 2, 2018 in Tokyo, Japan. (Photo by Jun Sato/GC Images)
TOKYO, JAPAN - FEBRUARY 26: Kim Kardashian is seen upon arrival at Haneda Airport on February 26, 2018 in Tokyo, Japan. (Photo by Jun Sato/GC Images)
LOS ANGELES, CA - FEBRUARY 25: Kim Kardashian is seen on February 24, 2018 in Los Angeles, California. (Photo by Hollywood To You/Star Max/GC Images)
LOS ANGELES, CA - FEBRUARY 24: Entrepreneur Kim Kardashian West at the Create & Cultivate Los Angeles conference in the Simon G. Jewelry Green Room on February 24, 2018 in Los Angeles, California. (Photo by Vivien Killilea/Getty Images for Create & Cultivate )
LOS ANGELES, CA - FEBRUARY 07: Kim Kardashian is seen on February 07, 2018 in Los Angeles, California. (Photo by BG002/Bauer-Griffin/GC Images)
LOS ANGELES, CA - FEBRUARY 07: Kim Kardashian is seen on February 07, 2018 in Los Angeles, California. (Photo by BG005/Bauer-Griffin/GC Images)
LOS ANGELES, CA - JANUARY 12: Kim Kardashian and Kanye West are seen on January 12, 2018 in Los Angeles, California. (Photo by BG022/Bauer-Griffin/GC Images)
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