The Geordie reality star appeared on the second series of the rebooted ITV2 show back in 2016.
Her boyfriend, Aaron, broke the sad news on Facebook on Thursday morning, writing: “I will never forget that smile. I love you so so much baby, you're my world forever and always.”
Close pal Holly Hagan also paid tribute on social media, tweeting: “You were only helping me battle the Twitter trolls yesterday. Rest in peace beautiful.”
Gradon coupled up with Tom Powell and Katie Salmon during her time on the show, becoming the first same-sex couple on the show.
The Miss Great Britain Twitter account also paid tribute saying: “Shocked beyond belief!!! RIP @sophiegradon sending all our love to Sophie’s family at this incredibly sad time xx.”
Shocked beyond belief!!! RIP @sophiegradon sending all our love to Sophie’s family at this incredibly sad time 😔xx— Miss Great Britain ® (@Official_MissGB) 21 June 2018
Northumbria Police issued a statement reading: "At about 8.27pm yesterday (June 20) police attended a property in Medburn, Ponteland, where sadly a 32-year-old woman was found deceased.
"There are not believed to be any suspicious circumstances surrounding her death. A report will now be prepared for the coroner."
Three days ago, Gradon posted a sweet message on her Instagram to her dad on Father's Day: "Happy Father’s Day! My rock & my absolute world, always full of adventure!!!
"Dadda, I love you so much. He despises me sharing any stuff on social media like this cos he’s way too modest but he’s gonna have to suck it up today cos he deserves an OBE for putting up with me!!
Tributes have poured in from her co-stars and friends, while fans have also been paying tribute on social media.
Standard Online have contacted representatives for Gradon.