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Before his tragic death, it appears Avicii was in a relationship with a Czech born model called Tereza Kačerová and was a doting stepdad to her young son.
Kačerová posted a heartfelt open letter to the Swedish DJ - who's real name was Tim Bergling - on her Instagram page and revealed that the couple had been planning on having children of their own before his untimely death.
Bergling was found dead in the Omani city of Muscat last week.
The letter said: "Dear Tim, I've spent the last days waiting to wake up, waiting for someone to tell me this is some sick joke, some awful mistake. I think it's finally settling on me now that I will truly never get to see you again."
She continues to talk about his relationship with her young son and to speak of the happiness that the pair had shared during their relationship.
She said: "I used to tell you that Luka will never remember a life without you. Now I hope that he will remember his life WITH you. I'll be there to remind him. I'll show him.
"Every time I think about something we won'd finish I feel physical pain in my heart.
"We never finished the Harry Potter marathon - we had the last one left - you never witnessed me having a meltdown when Snape dies.
"I never finished persuading you that our daughter's name MUST be Serafina. You never finished your tattoo sleeve in which the inner forearm would have a face coincidentally resembling mine."
The tragic letter explained that the nature of Avicii's fame meant that they were keen to keep their relationship a secret.
She continued: "I was always very set on keeping our relationship private because I wanted it to be OURS and ours only and wanted no part in that madness.
"But I thought, if I'm going to share this with the world, it will be when I'm pregnant with our child. Ohhh how that plan went awry.
"I called you baby angel. Little did I know how soon you would become one.
"The last words you ever said to me were "I love you". Well I LOVE YOU. As much as you love Mexican Coke... and then some."
Kačerová is a czech born model who grew up in the USA. She is perhaps best know for her appearance in the video for Maroon 5's 2014 hit song 'Maps'.
Tim Bergling's cause of death is not yet known, but his family released a statement that said the DJ "couldn't go on any longer".
However, a spokesperson for Avicii declined to confirm whether he had taken his own life.
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