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Azaylia died from blood cancer on Saturday aged just eight months. Doctors had previously stopped treatment, telling her parents there was nothing more they could do for her.
And her story touched people from all over the world, including celebrity followers who had been supporting Safiyya and Ashley on their journey since their daughter's diagnosis.
Love Island's Molly-Mae Hague was one celeb who extended her support for the couple, writing: "Heaven has gained the sweetest angel, my heart is broken."
Meanwhile, Kate Ferdinand penned: "So heartbroken for you all, rest in eternal peace beautiful Azaylia sending you so much love x".
Love Island's Malin Andersson - who also just lost a baby via miscarriage, and endured the death of her first child, Consy, too - shared her condolences, too, writing to Ashley and Safiyya: "Sending all my love."
Meanwhile, cleaning whizz Mrs Hinch - real name Sophie Hinchcliffe - wrote: "I am so sorry. Words will never be enough.
"Azaylia Diamond Cain left a mark on millions of people around the world, despite the short amount of time she graced our lives.
"A journey that will forever be in my memory. A little Lion we will never ever forget Ash and Saff You are an inspiration to us all I bow to you now and always Sleep peacefully our little lion (sic)."
"Heartbreaking... I'm so sorry to every single child and parent who is suffering, has suffered and will never stop suffering," said Loose Women's Stacey Solomon in her own tribute to the little one.
"It is so cruel and so unfair. Rest in Paradise Azaylia."
Meanwhile, former EastEnders star Jacqueline Jossa said: "I'm so sorry. Life is so unfair. Rest in peace you beautiful little girl."
Also voicing her support was fellow The Challenge star and Love Islander Georgia Harrison, who wrote: "Love you so much her life may have been short but she inspired so many lives encouraging people to sign up for the donor list.
"She has done more for the world than most people will achieve in 70 years and you two have given her the strength to do so xxxx."
Meanwhile, members of the public also voiced their heartache and shared sincere messages with the pair after following little Azaylia's battle.
"Someone once told me that a lifetime on Earth is the equivalent to a blink of an eye in Heaven," one wrote. "After you both have lived your lives and join Azaylia in Heaven, it will have been just the blink of her eyes that she spent without you".
Another wrote: "The most precious likkle lion who taught us all to appreciate, embrace & be strong every single moment we have.
"Safiyya and Ashley, thank you for sharing your precious angel and your journey with us, you have a special place in so many of our hearts.. Sending you love as always & always remember that you gave your baby girl the best a parent could give and more.. So sorry".
Ashley and Safiyya had been sharing their little one's journey in recent months, as she battled a rare form the blood cancer.
She was sent home earlier in April to enjoy her last few days out of hospital, after doctors told the couple she had cancerous tumours running through her whole body, and there was nothing more they could do to treat her condition.
While she battled on for a matter of weeks, Ashley and Safiyya had to return to hospital with their daughter several times this month - once because her heart rate soared to over 200, and also for a platelet transfusions.
The pair confirmed Azaylia's passing in individual posts on Sunday morning.
Alongside a tearful picture holding his now late daughter, Ashely wrote: "Rest In Paradise Princess. I will always hold you in my heart until I can hold you again in heaven".
Meanwhile, Safiyya emotionally shared her own snap with the little fighter, next to a caption which said: "You are my Angel my heartbeat my soul, RIP my precious baby, you will always be with me like a handprint on my heart".
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