During the bash, which was held at West Hollywood hotspot The Nice Guy, Kardashian, 40, ran into exes Younes Bendima, whom she split from in August 2018, and on-off fling Luka Sabbat,
who is also a friend of the famous family.
A source tells PEOPLE that “Kourtney said hi to Younes, but then didn’t have any other interaction with him.”
Kardashian, 40, wore a born top tucked into a pair of form-fitting pants, while Bendjima and Sabbat both opted for casual denim ensembles. Sister Kylie Jenner was also in attendance.
Although Simmons didn’t make an appearance on the 23-year-old model’s Instagram Story, she did share a photograph of herself cuddling up with the birthday boy, with whom she hosts her Beats 1 radio show.
Even after calling things quits, both Kardashian and Jenner appear to be on friendly terms with their exes.
Meanwhile, Kardashian invited both Bendjima and the grown-ish actor to her 40th birthday party earlier this year — and both exes were seen in photographs from the evening with the Keeping Up with the Kardashians star.
Kardashian and Sabbat, 21, called things off in October 2018 after casually dating for a few months, though they’ve since been spotted looking cozy.
The mother of three also had a friendly exchange with Bendjima, 25, on social media in April, shortly before her birthday.
After posting a photo slideshow of herself wearing a mini red leather dress paired with heeled sandals, Bendjima wrote, “Ya look good Minnie mouse.”
In an earlier affectionate gesture last December, the model shared some of his standout moments of 2018 on his Instagram Story, which included the time he spent with Kardashian.
Calling her “an amazing woman and mum,” Bendjima wrote that he couldn’t “forget about this beautiful woman inside and out,” as he wished both Kardashian and her children well.