Armstrong had posted a number of tributes to Gradon on his social media page, sharing images of the two together on nights out and on holiday.
The former Miss Great Britain coupled up with Thomas Powell in the villa but hit headlines when she began a relationship with fellow contestant Katie Salmon.
His death has been confirmed by the Northumbria Police department in a statement that read, "At around 12:20 p.m. today [July 10] police received a report from the ambulance service that a 25-year-old man had been found deceased at a property on Furnace Road in Bebside, Blyth".
Officials said there was no third party involvement suspected in the 25-year-old's death.
Aaron confirmed the ceremony was taking place as he shared a picture of the funeral booklet on Instagram with his 49,6000 followers, writing: "I love you with all my heart my attractive angel".
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He wrote next to a picture of her: "just wish I could cuddle you all day".
A family friend who didn't want to be named told The Sun Online: "We're absolutely gutted".
As news of her death emerged, Aaron posted a picture of the pair and wrote: "I will never forget that smile".
"I love you with all my heart Sophie u will always be in my heart you are my angel and I know you will be by my side everyday (sic)".
Gradon had previously spoken out about her battles with anxiety and depression.