The 23-year-old comedian returned to Instagram on Monday -- after deleting every pic he'd ever posted in the past -- to share a heartfelt and emotional message with his fans in which he celebrated his newfound sobriety.
"Remember to never give up hope because sometimes that's all we got," he concluded. "We are a family and I appreciate all your love and support. It's nice to be back in action."
Davidson also paid tribute to his girlfriend, sharing two cute pics of the pair, which he captioned, "Luckiest guy in the world."
Davidson has never shied away from talking about his drug use and his struggles with mental illness. In October, the SNL star -- who lost his father in the Sept. 11 terror attacks -- opened up to The Breakfast Club morning show about his battle with suicidal thoughts when he was younger, and said rapper Kid Cudi's music saved his life.