Chris Brown has a new album coming out later this month, and he says that might be it for him in the music biz, reports the Huffington Post. "Don't worry mainstream America," he tweeted. "After this X album, it'll probably my last album." (Note the deft use of the "probably" qualifier while getting in a mention of the title.) Brown also tweeted to say he's "tired of being famous for a mistake I made when i was 18," referring to the Rihanna assault. In other Brown news, he turned himself in on hit-and-run charges and was released on his own recognizance, reports TMZ.