Demi Lovato is celebrating six years of sobriety.

Demi has previously battled with substance abuse and self-harm

however that seems to be in the past as she uploaded a Tweet to celebrate the milestone.

She also told her millions of followers that they can overcome their own problems in life.

Demi previously admitted that she's been forced to give up partying as part of her battle against alcoholism,

because it can trigger her cravings.

And while the ‘Skyscraper’ singer admits that her new life sounds "boring", she's happy to make the sacrifice.

Congratulations, Demi!