The best day of Tom Mann’s life ended up turning into a day of “irreversible heartbreak.”.

Mann, best known for his appearance on the UK’s “X Factor” in 2014, shared tragic news on Instagram Monday, saying his beloved fiancée, Danielle “Dani” Hampson, died on their wedding day Saturday.

Posting a black-and-white photo of Hampson and their 8-month-old son, Bowie, Mann, 28, said he could not believe he was “writing these words.”.

“My darling Dani – my best friend, my everything and more, the love of my life – passed away in the early hours of Saturday morning, 18th June,” he wrote.

“We never made it to the altar; or got to say our vows, or dance our first dance, but I know you know that you were my entire world and the best thing that has ever happened to me, Danielle.”.

Mann, who appeared on the singing show as part of the boy band Stereo Kicks, said their son would provide him with the “strength” to cope.

Mann’s former Stereo Kicks bandmates rushed to the comments section to offer their condolences

He initially auditioned solo before being placed into Stereo Kicks by the judges