The former TOWIE star didn't directly mention Mark's name but it was obvious who she was talking about when she told Celebrity Big Brother housemate Ricci Guarnaccio about her ex of twelve years.
Lauren was talking about how she knows people look at pictures of her and think, 'Ew, I'd never go out with her…'
She then said: "My ex would say, 'Babe, we've been together twelve years. I've had top models but I'm engaged to and want to marry you. Your body to me… I've slept with top models in Miami but having sex with you is 100 times better than sleeping with them.
"That's why we stayed together 12 years. Our sex life kept us together. We fancied each other so much we had to stay together."
Lauren and Mark's romance played out on TOWIE, where viewers saw their ups and downs including an engagement and eventual break up.
Mark is now engaged to former Coronation Street star Michelle Keegan, while Lauren is currently single after a two-year relationship with Jake McLean.
Celebrity Big Brother airs nightly on Channel 5.
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