Vogue, 29, and 35-year-old made the announcement in June that they are to divorce after three years of marriage.
Model Vogue admitted she's aware her current situation is an unconventional one – but she doesn't have much choice.
Speaking to The Sun, she said: "My family find it strange but we've only just broken up and I haven't found somewhere else to live.
"I'm sure there will be a time when we're not in contact as much as we are now, but until I find somewhere else we're going to be in each other's lives."
Vogue, who met Brian at a party in 2011, stressed that there was no third party involved in their split.
She continued: "It just didn't work out. He wasn't with anyone else, I wasn't with anyone else, it was nothing to do with that. That's why we find it easier to be friends, maybe."
Brian and Vogue took to Twitter to break the sad news, with her writing: "It is with sadness that Brian and I have made the tough decision to go our separate ways.
"We will always care greatly about each other, remain friends and we wish each other all the very best for the future."