After a very public struggle with drugs and alcohol while filming Friends, Matthew Perry got clean and has stayed that way.
After a 15 year streak of never having sex sober or speaking to a woman while sober, Colin Farrell gave up his hard partying and womanizing ways.
Christina Ricci had some well-publicized issues with drugs and alcohol as a teen but then got clean and is now a teetotaler.
Joe Manganiello saw his life and career going to pieces in his early 20s and gave up alcohol for his job.
While many models struggle with drugs and alcohol, Tyra Banks has been clean since she was 12.
After losing himself in alcohol from ages 14 to 27, Gerard Butler got sober and has remained that way for the past 15 years.