The famous five stopped by the Apple Store Soho in New York City on Monday (14 September) to take part in the latest Meet The Developers session.
We can't remember the last time we saw all five together at a public appearance!
As you'd expect, the girls were glammed to the nines for the event, and seem to have co-ordinated their dressing to make sure everyone was in white, cream, navy or black.
Pregnant Kim, 34, opted for one of her favourite outfit combinations: figure-hugging dress, knee high boots and a long blazer.
Khloe, 31, looked fab in a strapless navy denim jumpsuit, while 19-year-old model Kendall, taking a break from New York Fashion Week, opted for smart black trousers and a striped blazer and Kylie, 18, chose high-waisted white trousers and a high-necked white lace top.
Finally, eldest sister Kourney, 36, chose a similar outfit to Kylie, teaming her white trousers with a white vest top.
Yesterday's event gave a handful of lucky people the chance to preview the Kardashian/Jenner sisters' brand new websites and lifestyle apps, which will give fans a behind-the-scenes look at their glam lives.
According to TIME, attendees were told they couldn't ask for selfies or autographs ahead of the girls discussing their projects, which have all launched, apart from Kourtney's, which launches later.
Each app has a different focus: Kim's is about fashion, Kylie's about make-up, Khloe's about fitness, Kourtney's about motherhood, and Kendall's about her jetsetting life.
You have to pay to access the app but the sisters said they will give fans more access into their lives than is currently available via their social media accounts. They also hope the paywall will stop trolls and haters.
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