The 36-year-old reality queen said he was "desperate" to get back at her eldest sibling by cavorting with actress Bella Thorne, 20, in Cannes.
Addressing the topic of Scott - who is the father to Kourtney's three children - the most famous member of the Kardashian clan said she thought his rumoured fling with the 20-year-old actress was all for attention. ' "And he was like, ' Yeah, I'm doing it to make Kourtney mad.' I said, ' You're not going to make her mad for the right reasons.'" Taking things a step further, Kim added: "I think it's clear to everyone that Scott's doing this just to try to one-up Kourtney and that seems super malicious." "Kourtney's genuinely trying to go away and have a good time and he's trying to like freak her out and make Kourtney think there's going to be some crazy drama run-in.
Talking to her younger sister Kendall Jenner about Scott's very hands-on holiday with Bella, she said: "They looked so desperate at the airport. It's not a good look for Scott." In response, the 21-year-old model revealed:"He talked to me about it. It's just so ridiculous." It comes as both Scott and Kourtney - who were together for nearly nine years - have moved on following a prolonged split.
Kourtney has been dating 24-year-old model Younes Bendjima since October 2016, while Scott has been linked to a number of beautiful women.
Earlier this summer it was rumoured that he and former child star Bella were an item - something she has since denied - before just weeks ago he and Sofia went public with their romance.
BELLA Thorne has hit the headlines for her sexy antics with Kourtney Kardashian's ex Scott Disick, and is now enjoying a blossoming film career.
Bella Thorne has taken to Instagram to call out her beau Mod Sun for still having a dating app on his phone.
The American actress was seen lazing around on Instagram with the sound of a phone going off in the background.
Trust me I’m so happy truly where I’ve longed to be.
Talking to the camera, a clearly emotional Bella said: "I just wanted to say anybody out there who’s a Lil Peep fan, you guys know how talented he was, you guys know how great he was.
"Well he was even more f**ing great as a person." She added on Twitter: "Peep you deserved more out of life.
She awkwardly captioned this with: ‘I love you.’ The pair seemed to be all loved up earlier this week when Mod greeted Bella in Salt Lake City with a bouquet of red roses.
But as the saying goes, never trust a man with flowers Bella, as they’re usually apologising for something.