Kourtney, Kylie and Kendall all showed up in WeHo at The Nice Guy to celebrate Daniel Chetrit's birthday ... he's the dude who's a DJ and co-hosts a podcast with Kendall.
Kacey Musgraves, Kyrie Irving, Ariel Winter, Ben Simmons and Devin Booker were also there to celebrate. BTW, Luka had reportedly hooked up with Kourtney a while back as well ... again, everything was cool Friday night.
Kourtney and Younes seem to be on-again, off-again since they started dating in 2016. They broke up last year, but have been seen together from time to time.
Kind of interesting ... Kourtney and Younes left The Nice Guy within minutes of each other.