Demi Lovato and longtime love Wilmer Valderrama celebrated a very special date this weekend–the three-year anniversary of the ‘Heart Attack’ singer’s sobriety.

Just three years ago Sunday, at the age of 19, Demi Lovato began counting the days she remained sober. Making it to the three-year mark is monumental.

Wilmer Valderrama praised her in an Instagram post.

“Today, we lay another stone together..It is now 3 years since you said: I am more important then any past, demon, disorder or addiction,” the former That ‘70s Show star wrote. “Where you decided that YOUR life was worth living while loving yourself.. And I’m sure glad you did… I knew then the woman you’ve become now.. I am proud and [honored] to be front row to see the world you are about to change. I love you Demi.”

A photo posted by Wilmer Valderrama (@wilmervalderrama) on Mar 15, 2015 at 12:59pm PDT

Demi Lovato replied, telling Wilmer Valderrama that she couldn’t have achieved her sobriety without his support.

“I wish I could put into words how grateful I am for this man right here. But my love has grown to a level that words could never possibly express how much this man completes me. He’s loved me the way I never thought I deserved to be loved and with this day marking my 3rd year sober… After sharing my ups, putting up with my downs and supporting my recovery… he still never takes credit and I want the world to know how incredible his soul is. I really wouldn’t be alive today without him. I love you Wilmer,” she wrote.

A photo posted by Demi Lovato (@ddlovato) on Mar 15, 2015 at 11:26pm PDT

It was only a few months ago that Demi Lovato praised Wilmer Valderrama for helping her not relapse into the throes of her eating disorder, making it quite clear that in addition to being in love, the two definitely work well together.

Fans have long hoped that Demi Lovato and Wilmer Valderrama will one day make their relationship permanent. Demi even admitted recently that if he proposes, she will definitely say yes.