The makeup mogul's driver accidentally crashed into her mom Kris Jenner's $400k Rolls-Royce Ghost while arriving at WeHo's Catch Steak Thursday for the brand's launch party -- and the collision's aftermath is captured in this wild clip.

Check it out ... as the KarJenners were arriving for Kylie's big launch event -- where she was plugging her new booze Sprinter -- one of the drivers behind the wheel in their fleet of SUVs, believed to be that of Kylie's, rammed into Kris's very pricey whip.

As the driver reverses ... you can see the impact was so strong that it left Kris's license plate dangling off the RR's bumper. It amounted to a fender-bender -- but it was still shocking.

Luckily, Kris's luxury ride doesn't seem too messed up ... and it looks like it'll just need a quick trip to the repair shop. That's a relief ... especially seeing how Kris was the first person to snag keys to the ride in 2021.

After the little vehicle run-in, the rest of the evening went on without a hitch for the Sprinter Soda bash, with host Kylie rocking a killer black plunging PVC dress.

Another thing to note -- this outing was the first one Kris made after the tragic news that her sister Karen Houghton recently passed just days earlier. She was all smiles for this, putting on a brave face no doubt.

Despite her personal grief, Kris rocked her momager hat like a boss ... showing up with her trademark support at her daughter's shindig.

As for the bumper thing ... leave it to the insurance.