LOS ANGELES, CALIFORNIA: The drama between the Kardashians escalated on Kim Kardashian's 43rd birthday. In her stories, Kourtney Kardashian posted throwback images of herself with her sister Kim, apparently taking a sly jibe at Kim as she wished her happy birthday.

This social media snub, however, was not an isolated incident but rather the latest skirmish in a long-standing sibling rivalry. The infamous feud between Kourtney and Kim was recently thrust into the spotlight on their Hulu show, with an intense phone call from the fourth season.

In that episode, Kourtney accused Kim of being "egotistical" and not being able to stand others grabbing the limelight, even referring to her as a "f**king witch."

Kourtney Kardashian skips Kim Kardashian's 43rd birthday bash

The drama unfolded on Kim's 43rd birthday when she threw a star-studded bash attended by family and friends, with one notable absence—Kourtney.

Kourtney took to Instagram to playfully mock Kim, insinuating that their on-screen brawls were child's play compared to their high school skirmishes.

She made a series of cheeky posts that seemed to further fuel the fire as she wished her sister on her birthday, with one image of the images branding Kim, the fashion icon, a "clown."

Posting a picture of the two together, she wrote, "Happy happy birthday to my first sister @kimkardashian ! Thank you for all those years of bossing you around and you actually listening to all of my crazy ideas."

She added, taking a sly jibe, "People think the fights they've seen on tv are bad. If only they got to witness the hair pulling, nail digging ones from early high school. The joys of sisterhood."

She concluded, "I love you deeply forever and always. May God bless this year with love and happiness and abundant joy." The wishes were cryptic, with some sentences seeming to drip with sarcasm.

While it's no secret that Kourtney is currently expecting, her absence at Kim's celebration raised eyebrows and fueled speculation that their ongoing discord played a role in her decision to skip the bash.

The feud between Kim and Kourtney ignited in Season 3 of 'The Kardashians' and even after one season, it shows no signs of cooling down.

The root of the trouble was Kim's decision to collaborate with Dolce & Gabbana for a '90s-inspired collection, a move that came mere months after Kourtney had partnered with the brand for her wedding to Travis Barker.

The clash between the two sisters over the brand deal has only intensified their longstanding feud, keeping fans of the show glued to their screens as they watch this sibling rivalry unfold.

Kourtney Kardashian calls Kim Kardashian 'f***ing witch'

In the tumultuous world of the Kardashians, the never-ending skirmishes and quarrels between siblings Kim and Kourtney have become something of a legend. However, in their upcoming season on Hulu, these sisterly squabbles appear to have reached an all-time high.

During a heated phone call that was captured in Season 4 of their Hulu show, things took a bitter turn. Kourtney, not mincing words, lashed out at Kim, accusing her of harboring a selfish, egotistical mindset.

She alleged, "You cannot stand someone else being the center of attention." Kourtney went on to bring up Kim's behavior at her wedding, stating, "You came to my wedding. You couldn’t be happy. You complained from the second you got there 'til the second you left."

In her eyes, the root of their discord was clear – Kim's jealousy of Kourtney's moments in the spotlight.

Kim, however, wasn't one to back down. She defended her stance, insisting that Kourtney's attitude was not an isolated issue. According to Kim, Kourtney's kids and friends had similar complaints.

In a tense exchange, Kourtney retaliated, "It’s like you’re just a f**king witch, and I hate you." Kourtney didn't hold back further and accused her sister Kim of being a narcissist. She boldly stated that her own life is consistently happier when Kim is not in the picture.

Khloe Kardashian pens heartfelt note on Kim Kardashian's birthday

As the Kardashian-Jenner family dynamics often unravel in the public eye, Khloe Kardashian stands out as the sister who has maintained a balanced and close relationship with her siblings.

Amid the recent family drama, Khloé not only organized a special birthday party for her sister Kim but also penned an emotional and heartfelt note that speaks volumes of their sisterly bond.

The Kardashian family celebrated Kim Kardashian's 43rd birthday at the chic Funke restaurant in Beverly Hills. Despite the ongoing tensions between some of the sisters, Khloe's gesture proved that their family bond is still strong.

She took to Instagram to post a picture of herself wearing a face mask with Kim's face on it, along with a touching note.

Khloé began by expressing the idea that no one should have to handle everything life throws at them alone. In her eyes, their connection was destined, with a higher power knowing what they needed.

She stated, "God doesn't intend for anyone to handle all life has to offer by ourselves. Luckily, I didn't have to look far for my people. We were destined to be together. He knew what He was doing. We need each other. I need you and I was blessed with you on this very special day!"

The note transitioned into a heartfelt tribute to Kim, highlighting her incredible qualities. Khloe described her as a superhero, someone capable of maintaining an exceptional level of calm even in the most chaotic situations.

She marveled at Kim's ability to navigate through life with an extraordinary level of clarity and purpose.

To emphasize Kim's extraordinary qualities, Khloe listed some of her "superpowers," which included resilience, calmness, manifesting anything she desires, and her unique ability to adapt and transform into various roles like a lawyer, friend, sister, daughter, mommy, CEO, and even a medical advisor.

Khloe left certain aspects of Kim's abilities to the imagination, adding a bit of intrigue to her tribute. She went on to declare that she'd do anything for Kim and that her love for her was boundless.

Khloe concluded the heartfelt note by describing Kim as her "sister soulmate," emphasizing their deep connection.

'The Kardashians' Season 4 premiered on Hulu on Thursday, September 28 at 12:01 am ET, with fresh episodes releasing every subsequent Thursday.