Rocker Pete Doherty has thanked his fans for supporting him during his battle against drugs. The Babyshambles frontman, 28, is currently fighting heroin and crack cocaine addictions at the Clouds rehab clinic in Wiltshire, England. Doherty is making sure he replies to all well-wishing fans, thanking them for their support, with a card updating them on his progress. The rocker claims he has been sober for 31 days.