Kylie Jenner Rides a Ghost (VIDEO)

Kylie Jenner took her new, $400,000 car out for a spin Friday night, as she discussed global warming with her friends.

The car's a Rolls Royce Ghost ... the newest edition to the 18-year-old's car collection, which includes a Ferrari and a G-Wagon.

Kylie got the car from Richie Rich, the go-to guy when you want an insanely expensive car.

BTW, they didn't really talk about global warming ... in fact they didn't even form full sentences.