Anotheryaoifreak, did I mention that I'm gay? All right, so I've been for a few minutes at most, but even so.
Gnurro: thank you for this, I missed it. Congratulations.
Beenjammin: It has never ever been said. In Study Break (2.12), Christo mentioned he had meant to see where she worked, which means pretty much no one knew at the time. (I've been trying to locate the page where she announces her getting a job, but can't seem to. I do remember Melanie gives her a drink on the house to celebrate, but where it took place also escapes me.) Given the secrecy she wraps herself into where personals are concerned, I'd say she hasn't let anyone know, with the possible exception of Wiley.
Oh, and I thought it had to be unusual for a girl her bust size not to wear a bra, but on reading the Rori DeClue-penciled chapter where she states she has big breasts, she also admits not to wear a bra. So for those who thought it meant something, it probably doesn't.
Edit about my previous comment regarding Michelle's job: I finally found where it is referenced (by looking for something else, figures): chapter 2.03, Power to the People, page 15. And the job is "dish pig" (sic) at Burrito Amigos, "that new Mexican joint".
So much for my guessing that it was a secret. Unless, of course, she lied to everyone about it to cover for a less respectable job ...