This timeline of Kourtney and Kim Kardashian's rocky relationship shows they've been feuding for years

A season 10 episode of "Keeping Up with the Kardashians" saw Kim request that her family members permit their likenesses to be used in her mobile game, "Kim Kardashian: Hollywood." 

All were happy to oblige, except Kourtney, who said she didn't "care to do random things" and initially refused.

Kourtney's partner at the time, Scott Disick, suggested that Kim buy Kourtney a pair of shoes to sweeten the deal, which led her to yell in frustration: "I'm not buying her a fucking pair of shoes, I bought her a fucking career!'' 

In the end, Kourtney signed off and was featured in the game, along with other family members.

Speaking on season 14 of the reality show's Christmas special, Kim recalled their squabble after accusing Kourtney of stealing her "vibe" because she opted for similar Christmas decorations.

"Last year, Kourtney and I got into the most epic fight because she fully copied my lights," Kim said. 

"I have warned everyone that I will come for them if they even dare try to copy anything that I'm doing this holiday season."

What began as a conversation about scheduling the family's annual holiday photo shoot during the season 15 premiere of "Keeping Up with the Kardashians" quickly descended into another one of Kim and Kourtney's explosive fights.

When they failed to agree on a time to take the photos due to their schedules, Kim told her sister: "Maybe if you had a fucking business that you were passionate about, then you would know what it takes to run a fucking business, but you don't."

Kourtney then walked out but overheard Kim adding: "She's the least exciting to look at, so she can be out."

Following their disagreement, a tearful Kourtney called their sister Khloé to fill her in on what went down and defended herself, arguing that she has different "values" than Kim.

"I choose to be a mother to my three kids, I'm not looking for another job. I already work enough, more than I would like to," Kourtney said.

When Kim — who was listening in — interrupted to tell her sister to be "accommodating," Kourtney snapped back.

"You are a very distraught, evil human being," she said. "I don't agree with who you are as a human being. I don't wanna see you, OK?"

Kim eventually tried to make amends, but Kourtney didn't accept her apology. The two remained on bad terms for a while, leading to Kourtney skipping Kim's baby shower for her youngest daughter, Chicago.

Tensions between Kourtney and Kim continued to rise later on in "Keeping Up with the Kardashians" season 15. Kim was left reeling when she learned Kourtney was planning to take her kids out of town for the Christmas holiday.

"Do you think it's like a cry for help, a cry for attention? Is she the new Rob?" Kim asked sisters Kendall and Khloé, referring to their brother, Rob Kardashian, who has been largely absent from the show and public appearances in recent years.

In the same conversation, she called her younger sister Kendall "such a fucking freak" for choosing to hang out with Kourtney. 

When Kendall responded: "Why? Kourt's my best friend right now!" Kim said: "I question your morals. I question your humanity."

Kim and Kourtney argued over their sartorial similarities in a season 17 episode after Kourtney enlisted Khloé's help in picking a dress for her 40th birthday party. 

When Khloé suggested they call Kim for her opinion on a pink vintage Dior mini dress, Kourtney said: "I don't know if I trust her opinion the most."

Despite this, Kim was called over FaceTime, and within minutes, the two came to verbal blows after Kim accused her older sister of "picking out all the same clothes."

"I don't know what you're talking about, I've never dressed like you," Kourtney snapped back.

The "Lemme" founder added in a confessional: "It's so ridiculous that we're even having a conversation like this because even if we wear the same designer, we wear it in a completely different way. The store may send me clothes that are more Kim's style, and I send them back."

Later on, she told her friend Sarah Howard the fight continued, with Kim calling her "the biggest ungrateful bitch" and her responding: "God! You're such a petty woman."

With Kourtney's birthday looming, the two patched things up a few days later, and Kim offered to let Kourtney wear her never-worn Versace dress to the party.

In season 17, Kim and Kourtney's very different positions on parenting and health sparked another argument after they started planning their daughters North and Penelope's joint Candy Land-themed birthday bash.

While Kim was interested in going all-out with popular sweets children know and love, health-conscious Kourtney tried to convince her sister to opt for less sugary snacks.

"It's Candy Land, Kourtney, it's not going to be healthy," Kim said. 

Kourtney replied: "I'm saying let's not do the nasty stuff with food coloring and all gross shit."

After their heated discussion, Kim threatened to call off the joint birthday party, but it worked out, with the two sisters finding a middle ground.

Suspecting that their sister had a new boyfriend, Kim and Khloé followed her during an episode of "Keeping Up with the Kardashians" season 17, only to find that Kourtney was being secretive because she was avoiding filming for the show.

Kim and Khloé criticized her for "not giving anything" to their audience when they confronted Kourtney during a business meeting.

As Kim pointed out in an on-camera confessional, Kourtney's decision to not to film as much meant that she and Khloé were "picking up the slack and having to share more" of their lives.

However, Kourtney was staunch, telling her sisters: "If I have boundaries, respect them."

She said there were certain sides of her life she wasn't comfortable sharing — namely, her dating life following her split from Scott Disick. 

"I said I will not share my relationships, that's it," she told her sisters. "I shared my breakdown, crying about having anxiety. I share other things."

Tensions between Kim and Kourtney sky-rocketed to new heights during a physical altercation filmed on season 18 of "Keeping Up with the Kardashians."

After Kim criticized Kourtney's work ethic, a physical fight between the sisters broke out as their younger sister, Khloé, unsuccessfully attempted to separate them. 

Later, in a remote interview with Jimmy Fallon, Kim revealed Kourtney also made her arm bleed during the fight. 

"When I looked down at my arm, and I saw that she had really scratched me, and I felt it all on my back, I just, you know, went over and slapped her back," she continued. "It's not my proudest moment, but we were going through it."

She added that the pair reconciled following the tense moment but that their mom, Kris Jenner, cried when she saw the violent clip: "She was like, 'Who are you guys?'"

After the episode with the fight aired, Kourtney indicated she was stepping back from filming with her family when she responded to a fan who tweeted that she should quit the show, writing that she did just that. 

Kourtney expanded on her reasons for taking a break from filming "Keeping Up With The Kardashians" in an interview for her Vogue Arabia cover story a few months later in July 2020, calling it a "toxic environment."

"I have been filming the show non-stop for 14 years … I was feeling unfulfilled and it became a toxic environment for me to continue to have it occupy as much of my life as it was," she said. 

Kourtney told the outlet her decision to step back wasn't because she didn't want to work and build her career. 

"People have this misconception that I don't want to work, which isn't true," she said. "I am following my happiness and putting my energy into that which makes me happy."

During the final season of "Keeping Up with the Kardashians," Kim accused her older sister of "yelling" at and "degrading" her kids' nanny over how she disciplined Kourtney's youngest son, Reign, on a family vacation to Idaho. 

"She was crying and she thought she was going to lose her job," Kim said about the nanny to Kourtney.

Kourtney denied raising her voice at the nanny, saying she confronted her about her disciplinary style after Reign, then 5, told Kourtney the nanny informed him he "would go to jail if" he "talked in the car." 

Kim said the nanny was upset that Kourtney confronted her at a restaurant, adding that she agreed it wasn't appropriate for Kourtney to have the conversation in public. To that, Kourtney said Reign prefers when she confronts people in front of him. 

"He wants to know that I have his back in front of him," Kourtney said. 

After Kourtney said she wouldn't allow Kim's nanny to be around her kids, Kim remarked that she "can't even keep a nanny."

In a subsequent confessional, Kourtney called the comment "hurtful" and accused Kim of "throwing out" random lies to intentionally hurt her.

They put their differences aside later in the episode after Kim visited Kourtney's home to apologize. 

Kim directed Dolce & Gabbana's Milan Fashion Week show four months after Kourtney and Travis Barker tied the knot in a wedding themed after the brand in Portofino, Italy.

In a season three episode of "The Kardashians," the family's newer reality show on Hulu, a teary-eyed Kourtney opened up to Kendall Jenner about feeling hurt by the collab in June 2023, according to People. 

"She sees everything that I had there and takes it for her own and she doesn't even see it, she sees it for the dollar signs," Kourtney said. 

Later in the episode, Khloé informed Kim of Kourtney's reaction and appeared to be taken aback.

In a confessional, Kim said she couldn't have handled the situation in a "more mindful" way. 

"I said don't do the Madonna Collection, don't do the Lace Collection, don't do anything that Kourtney wore to her wedding," Kim said, referring to her discussions about the show with the Dolce team. "She doesn't know that I have the email string begging them to push it a year."

During a confessional later in the season, Kim drew comparisons between her 2014 wedding to Ye, formerly known as Kanye West. 

"I got married in Italy. Am I saying you copied me by getting married in Italy? Who performed at my wedding? Who performed at Kourtney's wedding? Andrea Bocelli," she said on "The Kardashians."

"You stole my fucking wedding country and my wedding performer," Kim added. "Andrea Bocelli is my favorite male singer of all time, but I am copying her Dolce Vita lifestyle?"

In the same episode where Khloé informed Kim that Kourtney was upset about her Dolce business venture, Kim clapped back by saying her older sister doesn't have friends. 

Kim's dig came after Khloé said Kourtney told her all her friends disapproved of Kim's decision to work with Dolce & Gabbana after her wedding. 

"She's saying every one of her friends, but she doesn't have any friends," Kim said during the conversation. "So, Travis?"

Khloé and Simon Huck, a friend of the family who was also present during the conversation, weren't seen responding verbally. However, Khloé' was shown on camera opening her eyes widely, seemingly shocked at Kim's comment. 

The following episode saw Kourtney dig deeper into how she claimed Kim behaved at her wedding.

During a sit-down conversation with Kendall, Kourtney said she felt Kim didn't acknowledge how "amazing" her wedding was before collaborating with the brand. 

"She wasn't happy... at my wedding. Everyone else was like, 'Whoa, this is amazing. We're having the best time,'" Kourtney said. "She could never like, give acknowledgment of like, "Whoa, this is so amazing. I love this whole vibe. Do you mind, or how do you feel about me doing this?'"

The bad blood between the sisters showed no signs of stopping during a bitter phone call shown on Thursday's premiere of season 4 of "The Kardashians." 

Kim and Kourtney were filmed reviewing their reactions and conversations on a call about Kourtney's wedding. The call turned dark when Kourtney called Kim a narcissist, and Kim expressed concern over her sister's happiness. 

It culminated when Kim said everyone from Kourtney's friends to Kourtney's children complained about her behavior and revealed that a "Not Kourtney" group chat exists to discuss her. 

"It's you, and my friends, and my kids, and everyone against me," Kourtney responded. "You're just a fucking witch and I fucking hate you."

In a subsequent confessional shared by Kim and Kourtney, Kourtney said she felt Kim was using "any weapon that she could find" to hurt her. 

The day after season four of "The Kardashians" aired, Kourtney addressed the "Not Kourtney" group chat rumor on social media while responding to a fan. 

The mom of three, soon to be four, shared images on Instagram from a Disney-themed baby shower with her friends hosted by her mom, Kris, per People.

Kourtney quipped back after a fan asked if the friends pictured were part of the "'not Kourtney group chat' Cause if so we don't need them there."

"No the members of that chat are namely Kim, Khloé, Kendall and Kylie. Case closed," Kourtney wrote, according to the outlet.

Kourtney doubled down in an Instagram story by sharing a screenshot of what appears to be a  group chat between her and friends Allie Rizzo Sartiano, Simon Huck, and Phil Riportella, People reports. Kourtney also tagged their Instagram handles in the post.

"Should I soft launch the YASS Kourtney group chat?" Sartiano wrote, to which Kourtney replied with a series of crying laughing emojis.

 "I mean over a martini we will debrief but dang for a group chat that didn't exist I am fidgeting," Sartiano wrote. 

"Kim threw us all under the bus when there was not one actual friend on the chat," Huck added.