The couple - who were due to marry in early 2012 - called time on their eight-year relationship in the autumn, but both the Sugababes singer and the TV presenter insist the split is "amicable".
Writing on her twitter page, Heidi said: "Very sadly, after eight years together, myself and Dave decided to separate a few months ago. I wish him nothing but the best in life. (sic)"
A spokesperson for Dave added: "Dave Berry announced today that his engagement to partner Heidi Range has been broken off. Mr Berry announced the news today although the couple agreed to separate in the autumn.
"The split is amicable and no third parties are involved and he will make no further statement on the issue."
The pair got engaged during a holiday to India in 2009 and were hoping to tie the knot this winter, with Heidi recently admitting to already having found her "perfect dress".
She said: "We want to do it in the winter next year. I want to make sure everything's perfect!
"I've already found the dress, so I just need to find the venue and then everything else will fall into place."