The Birmingham-born beauty let her glossy brunette tresses billow in the wind as she celebrated her Instagram milestone.
She penned the caption: ‘Heaven is a state of mind 
15 million of you. I am amazed.
‘I never would have thought when I began Instagram and started modelling at 18 to have such an amazing fan base like I do now. I appreciate and love you all so much. Thank you for all your support.’
Despite her enviable lifestyle and frequent travelling, the social media star recently revealed that she has struggled with her mental health this year after losing both of her parents.
Demi lost her father Barrie Mawby at the end of 2018, with tragedy striking again soon after when her mother Christine pᴀssed away in June 2019.
In September, she emotionally discussed how she copes with her ongoing grief on Sky News with Kay Burley, in a bid to raise mental health awareness on World Suicide Prevention Day.
The lingerie model said: ‘Well, my mother, when I was 17, she had a heart attack which caused a stroke and it left her disabled.
‘Then in 2018, my dad pᴀssed away from cancer, then my mum, after being sick for so long, she pᴀssed away from a stomach infection. So it was really hard.’
On how she deals with the grief, Demi said: ‘I mean, it was really difficult, I’ve gone through stages of feeling my worst and now I’m at a place where I feel a lot better. It just takes time really.
‘I have some amazing friends and I do meditation. I have a lot of faith, so I pray and sound healing. I love sound healing.’
