Minogue's relationship with actor Julian McMahon back in 1994 left her with big financial problems.
The singer told BBC Radio 2: 'I was not only broke, I was in debt, a lot of debt, I had been very good with my finances up until the point where I got married.
'I was living in London and working in London, my fiancé and then husband was living and working in America, but he had only just started working there and I was financing both of our living costs in both countries at 22.'
The 39-year-old, who has recently had a son, Ethan, with partner Kris Smith, hoped Julian would get better with his money but it only got worse before they divorced two years later.
She added: 'I thought that once his career takes off and he's doing well, he'd put some money into the pot but that was a silly thought wasn't it!'
Dannii hopes she will never be in that position again.
She added: 'I'm just trying not to stuff it up again, hopefully I learnt the first time.'