The 28-year-old builder is eager to surprise the former glamour model when she leaves reality show 'Celebrity Big Brother', so has decided to construct a new feature in the garden of their home in West Sussex, south east England.
In a bid to put his unfaithful past behind him after cheating on the star last year with her pal Jane Pountney, Kieran was spotted at a nearby garden centre picking up supplies for a special eye-catcher, which he will be hoping will show how much he loves the 36-year-old entrepreneur.
The good deed comes days after Katie's fellow contestant on the Channel 5 show, Calum Best, expressed his boredom over Katie discussing her husband, with whom she has 17-month-old son, Jett Riviera, and five-month-old daughter Bunny.
He complained: ''For God's sake, I've heard Kieran's name 37,000 million times already - perhaps she should stop talking about her exes.''
Last week, it was also claimed her former friend, Jane, could be joining her in the house which could have an explosive outcome, however, her brother, Danny Ingham, has denied the claims on Katie's Twitter account by saying it ''won't happen''.
He tweeted: ''Certain paper thinks Jane is entering #cbb house - this won't happen, but if it did - she may well enter, but she probably wouldn't leave...''