What do these people do for a living to live such luxurious lifestyles?

i watch the hils and im niot a teen or 20 year old, im much older but like the show (why i am not sure) but what do all of these people do for jobs? Audrina? Spencer? Lo? i know that Lauren is paid for the show ,but what about the others, how does spencer afford the pricey SUV and flashy bling and clothes and not work??? I want to believe that maybe they do work and dont live off their parents like Brody Jenner does.. as well as his step sisters, the Kardashian whiner sisters???