Demi Lovato Celebrates 4-Year Sobriety Anniversary: 'Anything Is Possible'

Getty Images

Demi Lovato posted about being four years sober on Twitter.

“Stone Cold” sober! On Tuesday, Demi Lovato celebrated her most important anniversary – her sobriety. The “Confident” singer, 23, took to Twitter to share that she was four years sober.

“This last year I experienced so much life and too much death… But I made it through… Sober. #4Years #GodsWill,” she tweeted.

WATCH: EXCLUSIVE: Wilmer Valderrama Is Very Proud of Demi Lovato’s Emotional Music Video

Two days before the anniversary, Lovato tweeted, “I can’t believe I have four years on Tuesday.. Anything is possible.”

It’s been a year of extreme highs and extreme lows for Lovato, who released her album, Confident, this past fall to rave reviews. But the singer also suffered the loss of several family members and friends in addition to the deaths of two of her beloved dogs.

WATCH: EXCLUSIVE: Demi Lovato Says ‘Stone Cold’ Was the Hardest Music Video She’s Ever Shot

At the start of 2016, Lovato paid tribute to those lost loved ones on Instagram, writing, “I learned that no matter how painful things can be, things do get easier and time really does help heal all wounds. I'm so blessed to live the life I do, with the people I love by my side.”

The Disney alum has been an outspoken mental health advocate, candidly speaking about her addictions and struggles. In 2011, she entered rehab for substance abuse, bulimia, cutting and bi-polar disorder.