Uhh... Just because you're not aware of celebrity fashion brands doesn't mean they don't exist:

Mary Kate and Ashley Olsen - The Row

Jessica Simpson - eponymous

Gwen Stefani - LAMB

Jay Z - Rocawear

Beyonce - House of Dereon

P Diddy - Sean John

Kanye West

And these are just a FEW.

Celebrities selling clothes is pretty lucrative.

Ah, but every few months there's a new celebrity!