Brook, 34, and the former rugby star lost their first child on May 6 2011 when Kelly gave birth at just six months.
Brook has written in her autobiography that after the loss of her first child with Evans, the couple decided to go for a second child but within a few weeks, she suffered miscarriage, reported the Daily Mirror.
After the miscarriage Thom and I decided it was time to make a fresh start ... Thom proposed. He'd bought a beautiful ring. I immediately said yes. The miscarriage actually brought us closer together.
Brook also revealed that post her miscarriage, Evans did not appear interested in her and put his modelling career over her.
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"We were still engaged in November 2012... Not long after that, he and I split up. His modelling career was picking up and a big US agent wanted to represent him. He was excited and so was I. I suggested we rent a flat in LA so I could visit," she added.
"He wanted to focus on his 'new life' in LA, a wife and children would slow him down. He didn't want to be in a relationship anymore. It was obvious," said Brook, who is now dating 'Gladiators' actor David McIntosh.