In you haven't heard, October 5th is casual dress day -- no matter where you work. Just bring $5 and you can hang out in your jeans at the office (or wherever). That's because it's Lee National Denim Day, a fund-raiser to help raise money for the Women's Cancer Programs of the Entertainment Industry Foundation.

To promote the special event, Billy Ray Cyrus has recorded a public service announcement, in which he talks about the importance of fighting breast cancer -- a battle he's acutely aware of as a father to three daughters. The singer is even offering fans a chance to win a copy of his new album, and a signed Gibson guitar -- all you have to do is sign up to participate at denimday.com.

So get involved! Even if you aren't a Billy Ray Cyrus fan, it's a great cause, and easy to take part. Besides, who doesn't like wearing jeans to work?