The Wanted star Tom, who competed on the last series of The Jump, walked hand-in-hand with his fiancée Kelsey, who braved the chill wearing a monochrome stripy dress.
The couple beamed for photographers as they arrived at Kensington Roof Gardens for the star-studded event.
And the night was a great success, as Tom later revealed that more than £50,000 was raised!
Last month Tom revealed that he and his long-term girlfriend Kelsey, who have been dating since 2009, are now engaged.
The pair announced their exciting news on Twitter, later making their debut as a newly engaged couple at the Batman V Superman: The Dawn of Justice film premiere
Tom had tweeted about the pair's engagement last month: "So Me and @MissKelseyH may have gone and get engaged over the weekend."
Kelsey had said: "Yay! I can finally tell you all.. @TomParker proposed to me.. He liked it and put a ring on it (about time ) let's plan a wedding xx."
London Marathon fundraising event, Jog On To Cancer, is in aid of Cancer Research UK. To find out more about Cancer Research UK's 2017 marathon team visit cruk.org/marathon
Try Reveal's digital edition on iPhone & iPad. Subscribe now & never miss an issue!