Demi Lovato celebrated an important personal milestone today as the singer revealed to fans that today marks her fourth year of sobriety. "This last year I experienced so much life and too much death... But I made it through... Sober," she tweeted. After overcoming this hurdle, she added that "anything is possible." In our 2015 cover story, Demi went into a little more detail of her struggles and how it affected her life and her relationship with her boyfriend, actor Wilmer Valderrama.

"The only times that we were off was when I was not in a healthy state of mind, or he was like, 'I can’t be with you until you get sober. I can’t enable what you’re doing right now.'” She also told us that she is open with fans, but hasn't always explained the heaviest parts of her struggles in years past. "If you were to sit my friends and me in a group together and we all shared our life stories, you wouldn’t understand how we’re still alive because of either our addictions or the stuff that we’ve survived."

Clearly, sobriety agrees with Demi as the singer released an incredibly successful album, Confident, started her own record label with Nick Jonas, and is about to head out on her Future Now Tour. Incredible accomplishments all around. You can revisit our cover story with Demi here.