Currently in Australia, Demi may be without her long-term beau, but she has proven he is still all she can think about when away from home.
Taking to Instagram, the 'Neon Lights' singer shared a very sweet photo of herself and Wilmer together, paying her other half a touching tribute alongside her pic.
In her snapshot, Demi - rocking a gorgeous slick of red lippie - can be seen cutely planting a kiss on Wilmer's cheek. Don't they make a glam couple?!
Next to her picture of the pair together, she said: "#FBF to 4 1/2 years ago and yet all this time later... I still cry when I leave him for tour and I still get butterflies just thinking about him. You're magical Wilmer... I love and miss you..."
Not only does Demi think that she and her That '70s Show love are perfect together, but her fans do too and they couldn't wait to tell her so on seeing her adoring post.
Many told the starlet they were hoping to hear wedding bells and one user even said: "You're perfect together <3 Just get married and have a beautiful baby."
Meanwhile, It's not the first time Demi has publicly gushed about boyfriend Wilmer over social media.
To mark three years of sobriety last month, Demi took to Instagram to thank her other half for all his love and support since getting together.
Along with a photo of the pair kissing, Demi said: "I wish I could put into words how grateful I am for this man right here... I really wouldn't be alive today without him. I love you Wilmer."
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Watch Demi's video for 'Skyscraper' here: