Did Ryan Adams (the singer) go through rehab or get cleaned up alcohol or drug wisein the last couple of years?

He seems like he was messed up for so long and the last few interviews I have seen he is very alert, very personable, and well, seems to be able to connect with people. I know he just got engaged and then married to Mandy Moore and I cant see her marrying a totally messed up guy so did he actually clean up!??! I just havent seen much else about him in the news.