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The 28-year-old singer - who competed on the ITV show in 2014 as part of boyband Stereo Kicks - was due to marry the 34-year-old backing dancer and PR executive, with whom he shared an eight-month-old son, on Saturday 18 June.
Mann reposted on his Instagram stories a picture of close friends and family at a picnic, captioned: "Today was for our Dani."
He added: "There are honestly no words to describe just how much I miss you Dan. Forever & always."
The cause of Hampson's death is unknown.
We were very saddened to hear of the passing of Dani Hampson who was part of the Spiceworld 2019 family. Sending love and strength to Tom, Bowie and Dani’s family and friends ❤️ pic.twitter.com/2eFGoGdjEe
— Spice Girls (@spicegirls) June 21, 2022
The Spice Girls tweeted: "We were very saddened to hear of the passing of Dani Hampson who was part of the Spiceworld 2019 family. Sending love and strength to Tom, Bowie and Dani’s family and friends."
Donald said: “I’m gutted beyond words that one of our dancers on Wonderland has passed away.
“What a beautiful and super talented dancer she was. I’m happy to say I danced with her and the UK dance world will be shocked and saddened just like I am.”
Cowell said in a statement to TMZ: “As a father myself, I simply cannot imagine the heartbreak Tom and his family are going through and will be personally reaching out to him. From my family to his, we extend our deepest condolences and all of our love during this tragic time.”
Man and Hampson began dating in 2015 and became engaged in December 2019, seven months after buying their first home together.
Their wedding had been delayed due to coronavirus and they welcomed son Bowie in October 2021.
Mann previously announced her death on Instagram, revealing: "I can’t believe I am writing these words but 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."
Confirming she had passed away on the morning of their wedding he went on: "On what was supposed to be the happiest day of our lives ended in irreversible heartbreak. I feel like I have cried an ocean. We never made it to the alter; 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. I will wear this ring that I was always supposed to wear as a sign of my unconditional love to you."
Among those to offer their condolences on social media were fellow musicians Lewis Capaldi and Ellie Goulding.
For confidential emotional support at times of distress, contact The Samaritans at any time by calling 116 123 or emailing email@example.com.
Watch: Simon Cowell sent condolences to Tom Mann following Dani Hampson's death