Does anyone know how to audition or whatever to be in a music video?

It's like, one of the number 1 things I wanna do in life. Sounds lame, but I'm always jealous of the girls in music videos with like, Chris Brown & Justin Bieber, & if I saw one of my friends in one of those videos, I'd be extremely jealous lol. So does anyone know how to audition to be in one? If you audition for them. Preferabbly people like Justin Bieber, Chris Brown, Drake. Thanks girls <3