The British singer took to Twitter on Saturday, September 08 and shared video footage of herself from an earlier concert in Europe, where she had introduced a performance of their single, Lonely Together, by holding a moment of silence shortly after the dance superstar's apparent suicide in April.
In the clip, she remembered Avicii as an "incredible" talent and one of her "dearest" friends, admitting, "(He) changed my life".
"Happy birthday @Avicii. We miss you every day," she captioned the post.
Fellow DJ/producer Kygo also took a moment to remember his late pal with a picture of the pair embracing.
"Happy birthday legend," he wrote beside the image. "you will always be my biggest inspiration".
Meanwhile, French hitmaker David Guetta also opened up about how Avicii's shock passing impacted his approach to his hectic lifestyle, revealing he actively took steps to try and avoid falling into bouts of depression.
"We were all incredibly shocked by what happened," the 50-year-old superstar told The Sunday Times Culture magazine of Avicii's loss. "It's forced me to make some hard decisions, to change my life. I could see it coming in myself, this depression. And I'm a happy person, I'm really not a depressive type.
"But I realised I needed to reorganise my life to stay like this. I remember Avicii telling me how many shows he was doing a year and thinking, 'This is horrible. It's torture.' But it's hard to say no. You want to do what's right for your career. But if you keep saying yes, one day you'll fall".
Guetta's remarks echo those recently made by dance peer Alesso, who confessed the tragedy made him "start rethinking" how he would handle his busy schedule going forward in an effort to protect his mental wellbeing.