Kidman previously reflected on the miscarriages in a November 2007 interview with Marie Claire.
'From the minute Tom and I were married, I wanted to have babies,' she told the publication at the time. 'And we lost a baby early on, so that was really very traumatic. And that ’s when it came that we would adopt Bella.'
The couple adopted two children during their marriage - Isabella, 25, and Connor, 22.
'My mother has an adopted sister, so it’s been part of our family and I knew it would probably play out somewhere in mine,' Kidman told Marie Claire. 'I didn’t think it would happen so early but it did'.
Nicole, who wed Australian country crooner Keith Urban in 2006, has previously spoken about her relationship with Cruise.
'I was a baby when I married Tom,' she once told the Evening Standard. 'I don’t regret any of it, but out of respect for Keith, I tend not to discuss any of that now.'
Kidman and Urban, 50, share two daughters, Sunday, 9, and Faith, 7.