Britney Spears does not have a valid California driver's license -- she does have one in LA, but someone should tell her that LA is Louisiana, not Los Angeles!
TMZ did some digging and found that Brit has a valid license in her home state of Louisiana, but she doesn't live there. A rep for the DMV tells TMZ that in California, you have 10 days to apply for a license after arriving here as a resident, and Brit never completed the process. Examinations is hard, y'all! She did, however, appear in Louisiana in December of 2005 to renew her license, which is valid through December of 2009.