The reality TV stars made an official announcement on Kate’s Instagram page, alongside a snap of the couple and their three-year-old son, Xavier.
"It is with great sadness we share that Harry and I are no longer together," Kate shared.
Kate, 29, and Harry, 32, revealed that their main priority has been to look after their son "over the over the last few months."
"We are both committed to co-parenting Xave, with his wellbeing as our number one priority," Kate continued.
In February, the model told an Adelaide newspaper they split because she and Harry ‘just drifted apart’ after House Rules filming finished in 2017.
"We remain great friends and look forward to what the next chapter brings," Kate wrote on Instagram.
Xavier is their only child and the two were together for nine years.