The "Keeping Up with the Kardashians" star shared an Instagram post claiming her younger sister had abandoned her during their night out to an Oscars after-party over the weekend (February 08-09). In pictures obtained by Dailymail.com, the trio was pictured arriving at Beyonce Knowles and Jay-Z's exclusive Gold party.
"Date night, even though she ditched me half way through," she wrote, alongside snaps of the sisters together.
The post came just one day after Khloe said on Twitter that Kourtney had "ruined" her night at the bash - although she didn't reveal any further details.
Tagging her sister Kylie Jenner, who was also in attendance, Khloe tweeted, "Ugh why did @KylieJenner and I allow @kourtneykardash to ruin our night last night ? Ugh."
The Good American fashion designer added in another tweet, "Oh @kourtneykardash!!!!!!"
Despite the apparent fallout, the sisters were active on social media during the night out and shared a number of snaps together on their Instagram Stories.
In one clip, Khloe called Kourtney a "gorgeous girl" as they traveled in a limousine together, while she captioned another post, "Date night with my sister work wife @kourtneykardashian."
The siblings notably had a falling out last year, when Kourtney revealed she wanted to step back from the family's reality TV show in order to focus more time and attention on her three kids.