This year the family occasion saw three-year-old Stormi, born February 1, and four-year-old Chicago, born on January 15, enjoy a lavish fun-filled day, held outdoors and featuring balloon-adorned displays.
The event, that gave way to Barbie-decorated décor, saw Jenner - who's currently expecting her second child with partner Travis Scott - dressed in a bubblegum-pink look.
Other noteworthy details from the day included Stormi and Chicago's name in blown-up writing against a balloon-festooned backdrop.
Characterful pink-iced sweet treats also spelled out the girls' names, as well as specially wrapped ice-creams cones among multicoloured characterful snacks and an intricate, tiered cake that formed a barbie doll.
Of course, it wasn't the only cake either.
A hilarious moment from the party involved mother-of-three Kourtney Kardashian, who was seen dancing behind a person dressed in animated costume.
Just last month, the eldest Kardashian sister celebrated the joint birthday of two of her children - Mason, 12, and Reign, seven, - who she shares with her ex-partner Scott Disick.
Despite the joyful moments from Stormi and Chicago's joint birthday celebrations, model Kendall Jenner was noticeably absent.
However, it was Kim Kardashian's estranged husband Kanye West's appearance at the party who became a talking point among fans.
In a video obtained by TMZ, the musician claimed he had not been informed of his daughter Chicago's fourth birthday celebrations.
'Y’all, I’m just wishing my daughter a public happy birthday. I wasn’t allowed to know where her party was,' he reportedly said in the video.
'It’s nothing legal. These are the kind of games being played.'
The 44-year-old rapper continued, noting: 'Won’t nobody give me the address to my daughter’s birthday party right now and that’s gonna imprint in her mind that I wasn’t there for her.
'My whole schedule is based around me being able to take my kids to school, me being there for them, making sure that I’m in their life.'
The musician was later seen at the party and playing with his youngest daughter. He also gave a shout-out to Scott for giving him the details about the party.
'I’m so happy right now, I just came from Chi’s party,' West said in a video, per Hollywood Unlocked). 'I just gotta shout out to Travis Scott for sending me the address and the time and making sure that I was able to spend that birthday memory with my daughter.'
In other news, Kim Kardashian marked Chicago's birthday with a sweet Instagram post.
The images posted in honour of her second youngest child's birthday were accompanied by a caption that read: 'My birthday baby girl Chi Chi turns 4 today! My independent baby girl twin. You are the most lovable huggable snuggable baby girl on the planet. The ultimate princess! I can’t wait to celebrate with all of the Barbies and LOL Dolls a girl could dream of lol. You really have brought so much joy into our family and I love you so so soooo much!!!! [sic]'
As for Jenner, as well as sharing footage of her daughter and niece's joint celebrations, the 24-year-old posted images on Instagram seemingly taken from her baby shower ahead of her tot's arrival.
Lately, Jenner has been at the centre of rumours speculating she's already given birth to her second child.
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