Demi Lovato is celebrating three years of sobriety, and, using the power of social media, has credited her recovery to long-term boyfriend Wilmer Valderrama. In a loving tribute on Instagram, Demi wrote: "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."
Demi's Instagram snap was liked by her millions of fans
The singer, 22, lived with drink and drug addiction, as well as eating disorders, for several years, but has overcome her struggles to become a judge of the US version of The X Factor and release her fourth album Demi - her most successful album to date.
On Twitter Demi also thanked her fans, writing: "I'm still catching up to texts and congrats tweets... Thank everyone who has supported my journey. I never knew sobriety was possible for me.
"But with the love and support I've been given from my friends, fans, and family.. I now celebrate my 3rd birthday. Thank you to everyone."
Demi Lovato and WIlmer Valderrama in 2015
Demi also showed her love for Wilmer in January, when she threw her beloved a surprise 35th birthday party, attended by his former The 70's Show co-stars Ashton Kutcher and Mila Kunis.
The shindig was held at Palms Thai in Los Angeles, with a shocked Wilmer arriving at the restaurant to find around 40 of his friends waiting to celebrate his special day.
"Wilmer got there later," an eyewitness told Us Weekly. "Giving his friends a chance to get there first. He was surprised!"