Blackpool born Coleen Nolan has filed for divorce from her husband of 10 years Ray Fensome.
The Loose Women panellist, 52, said she was sad to announce the split after "much hard work and many efforts" to save the relationship.
Writing in the Daily Mirror, where she is the paper's agony aunt, she said: "Me and my husband Ray are divorcing. I wanted to tell you first as I can hardly sit here and keep dishing out advice if I'm not being totally straight about what is going on in my own life.
"It's hard to imagine that so much could have changed from that day in 2008 when we married.
"On that day, I thought there was nothing that could split us up. I was convinced we'd grow old together, hobbling to the post office to collect our pensions.
"But a decade on and it's now clear I was wrong. There is too much dividing me and Ray. We can't go back. And my future is going to be very different to the one I'd imagined back then."
She added she thought her time in the Big Brother house would serve as time apart to get the marriage back on track but "even having time out to think wasn't enough to save us".