Kate, who is due to give birth to her first baby in October, told Hello magazine she was 'stunned' to discover she was pregnant after years of trying to become pregnant and four rounds of failed IVF with husband, Mike Heron.
She said: 'This baby is the closest it gets to a miracle for me. Mike and I resigned ourselves to being childless. We felt desperately sad about it but, as a positive person, my philosophy was that everyone faces challenges in life, and very often much worse than ours.'
Kate had been told she was unlikely to get pregnant naturally after losing an ovary at 29, and couldn't believe it when she saw the positive result on a pregnancy test earlier this year.
'When it happened naturally, I was stunned,' admitted Kate. 'It defied medical opinion and my wildest hopes. When the control line turned blue, I thought it was fate mocking me.
'But then the second line turned blue, too. I stared at it in disbelief. That was the start of this new life. I still carry the test around in my handbag with me.'
Aww, congratualtions Kate and Mike!